<?xml version="1.0" encoding="utf-8"?>
<!--Generated by DataTracks Rainbow version 3.5 for DFIN Solutions on 30-March-2024 [02:11:41] {PM}-->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:xbrldt="http://xbrl.org/2005/xbrldt">
<roleRef xlink:type="simple" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#ConsolidatedStatementOfChangesInEquityOfAegonLtd" roleURI="http://www.aegon.com/role/ConsolidatedStatementOfChangesInEquityOfAegonLtd" />
<roleRef xlink:type="simple" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#ConsolidatedStatementOfChangesInEquityOfAegonLtdParenthetical" roleURI="http://www.aegon.com/role/ConsolidatedStatementOfChangesInEquityOfAegonLtdParenthetical" />
<roleRef xlink:type="simple" xlink:href="https://www.esma.europa.eu/taxonomy/2022-03-24/esef_cor.xsd#ifrs-dim_role-990000" roleURI="https://www.esma.europa.eu/xbrl/role/cor/ifrs-dim_role-990000" />
<roleRef xlink:type="simple" xlink:href="https://www.esma.europa.eu/taxonomy/2022-03-24/esef_cor.xsd#esef_role-999999" roleURI="https://www.esma.europa.eu/xbrl/role/cor/esef_role-999999" />
<roleRef xlink:type="simple" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#Anchoring" roleURI="http://www.aegon.com/role/Anchoring" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/notAll" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#notAll" />
<arcroleRef arcroleURI="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/arcrole/esma-arcrole-2018-11-21.xsd#wider-narrower" />
<definitionLink xlink:type="extended" xlink:role="http://www.aegon.com/role/ConsolidatedStatementOfChangesInEquityOfAegonLtd">
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_StatementOfChangesInEquityLineItems" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_CouponsOnNonCumulativeSubordinatedNotes" xlink:label="loc_agn_CouponsOnNonCumulativeSubordinatedNotes_876544" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" xlink:to="loc_agn_CouponsOnNonCumulativeSubordinatedNotes_876544" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_CouponsOnPerpetualSecurities" xlink:label="loc_agn_CouponsOnPerpetualSecurities_295" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" xlink:to="loc_agn_CouponsOnPerpetualSecurities_295" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsPaid" xlink:label="loc_ifrs-full_DividendsPaid_293" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" xlink:to="loc_ifrs-full_DividendsPaid_293" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Equity" xlink:label="loc_ifrs-full_Equity_876654" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" xlink:to="loc_ifrs-full_Equity_876654" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_296" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_296" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners_297" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners_297" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_IssuanceAndPurchaseOfTreasuryShares" xlink:label="loc_agn_IssuanceAndPurchaseOfTreasuryShares_291" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" xlink:to="loc_agn_IssuanceAndPurchaseOfTreasuryShares_291" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IssueOfEquity" xlink:label="loc_ifrs-full_IssueOfEquity_290" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" xlink:to="loc_ifrs-full_IssueOfEquity_290" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeAbstract" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeAbstract_261" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeAbstract_261" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract" xlink:label="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_263" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_OtherComprehensiveIncomeAbstract_261" xlink:to="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_263" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DiscontinuedOperationsThatWillBeReclassified" xlink:label="loc_agn_DiscontinuedOperationsThatWillBeReclassified_855913" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_263" xlink:to="loc_agn_DiscontinuedOperationsThatWillBeReclassified_855913" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax" xlink:label="loc_ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax_281" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_263" xlink:to="loc_ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax_281" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_GainsLossesOnDisposalOfFinancialAssetsMeasuredAtFVOCIMayBeReclassifiedSubsequentlyToProfitOrLoss" xlink:label="loc_agn_GainsLossesOnDisposalOfFinancialAssetsMeasuredAtFVOCIMayBeReclassifiedSubsequentlyToProfitOrLoss_876572" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_263" xlink:to="loc_agn_GainsLossesOnDisposalOfFinancialAssetsMeasuredAtFVOCIMayBeReclassifiedSubsequentlyToProfitOrLoss_876572" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_GainsLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax" xlink:label="loc_ifrs-full_GainsLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax_876571" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_263" xlink:to="loc_ifrs-full_GainsLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax_876571" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss" xlink:label="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss_286" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_263" xlink:to="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss_286" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax" xlink:label="loc_agn_MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax_282" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_263" xlink:to="loc_agn_MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax_282" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherComprehensiveIncomeRecognizedToGroupAssets" xlink:label="loc_agn_OtherComprehensiveIncomeRecognizedToGroupAssets_285" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_263" xlink:to="loc_agn_OtherComprehensiveIncomeRecognizedToGroupAssets_285" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:label="loc_agn_OtherOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax_287" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_263" xlink:to="loc_agn_OtherOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax_287" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ShareOfOtherComprehensiveIncomeOfAssociatesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:label="loc_agn_ShareOfOtherComprehensiveIncomeOfAssociatesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax_284" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_263" xlink:to="loc_agn_ShareOfOtherComprehensiveIncomeOfAssociatesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax_284" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ShareOfOtherComprehensiveIncomeOfJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:label="loc_agn_ShareOfOtherComprehensiveIncomeOfJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax_283" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract_263" xlink:to="loc_agn_ShareOfOtherComprehensiveIncomeOfJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax_283" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract" xlink:label="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract_262" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_OtherComprehensiveIncomeAbstract_261" xlink:to="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract_262" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DiscontinuedOperationsThatWillNotBeReclassified" xlink:label="loc_agn_DiscontinuedOperationsThatWillNotBeReclassified_855906" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract_262" xlink:to="loc_agn_DiscontinuedOperationsThatWillNotBeReclassified_855906" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisposalOfGroupAssets" xlink:label="loc_agn_DisposalOfGroupAssets_876653" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract_262" xlink:to="loc_agn_DisposalOfGroupAssets_876653" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss" xlink:label="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss_278" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract_262" xlink:to="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss_278" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability_876540" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract_262" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability_876540" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesFromInvestmentsInEquityInstruments" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesFromInvestmentsInEquityInstruments_876539" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract_262" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesFromInvestmentsInEquityInstruments_876539" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_277" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract_262" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_277" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRevaluation" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRevaluation_276" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTaxAbstract_262" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRevaluation_276" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InsuranceItemsThatMayBeReclassifiedSubsequentlyToProfitOrLossAbstract" xlink:label="loc_agn_InsuranceItemsThatMayBeReclassifiedSubsequentlyToProfitOrLossAbstract_876560" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_OtherComprehensiveIncomeAbstract_261" xlink:to="loc_agn_InsuranceItemsThatMayBeReclassifiedSubsequentlyToProfitOrLossAbstract_876560" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ChangesInCashFlowHedgingReserveFromInsuranceContractsIssuedOtherComprehensiveIncomeBeforeTax" xlink:label="loc_agn_ChangesInCashFlowHedgingReserveFromInsuranceContractsIssuedOtherComprehensiveIncomeBeforeTax_876595" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_agn_InsuranceItemsThatMayBeReclassifiedSubsequentlyToProfitOrLossAbstract_876560" xlink:to="loc_agn_ChangesInCashFlowHedgingReserveFromInsuranceContractsIssuedOtherComprehensiveIncomeBeforeTax_876595" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncomeExpensesFromReinsuranceContractsHeldExcludedFromProfitOrLossBeforeTax" xlink:label="loc_ifrs-full_FinanceIncomeExpensesFromReinsuranceContractsHeldExcludedFromProfitOrLossBeforeTax_876548" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_agn_InsuranceItemsThatMayBeReclassifiedSubsequentlyToProfitOrLossAbstract_876560" xlink:to="loc_ifrs-full_FinanceIncomeExpensesFromReinsuranceContractsHeldExcludedFromProfitOrLossBeforeTax_876548" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_GainsLossesOnFinancialAssetsFromInsuranceContractsIssuedMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax" xlink:label="loc_agn_GainsLossesOnFinancialAssetsFromInsuranceContractsIssuedMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax_876649" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_agn_InsuranceItemsThatMayBeReclassifiedSubsequentlyToProfitOrLossAbstract_876560" xlink:to="loc_agn_GainsLossesOnFinancialAssetsFromInsuranceContractsIssuedMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax_876649" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_GainsLossesTransferredToIncomeStatementOnDisposalOfFinancialAssetsMeasuredAtFVOCI" xlink:label="loc_agn_GainsLossesTransferredToIncomeStatementOnDisposalOfFinancialAssetsMeasuredAtFVOCI_876582" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_agn_InsuranceItemsThatMayBeReclassifiedSubsequentlyToProfitOrLossAbstract_876560" xlink:to="loc_agn_GainsLossesTransferredToIncomeStatementOnDisposalOfFinancialAssetsMeasuredAtFVOCI_876582" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxRelatingToInsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss" xlink:label="loc_ifrs-full_IncomeTaxRelatingToInsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss_876666" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_agn_InsuranceItemsThatMayBeReclassifiedSubsequentlyToProfitOrLossAbstract_876560" xlink:to="loc_ifrs-full_IncomeTaxRelatingToInsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss_876666" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedExcludedFromProfitOrLossThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:label="loc_ifrs-full_InsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedExcludedFromProfitOrLossThatWillBeReclassifiedToProfitOrLossBeforeTax_876547" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_agn_InsuranceItemsThatMayBeReclassifiedSubsequentlyToProfitOrLossAbstract_876560" xlink:to="loc_ifrs-full_InsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedExcludedFromProfitOrLossThatWillBeReclassifiedToProfitOrLossBeforeTax_876547" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_TotalOtherComprehensiveIncomeLoss" xlink:label="loc_agn_TotalOtherComprehensiveIncomeLoss_876676" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_OtherComprehensiveIncomeAbstract_261" xlink:to="loc_agn_TotalOtherComprehensiveIncomeLoss_876676" use="optional" order="36" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLoss" xlink:label="loc_ifrs-full_ProfitLoss_275" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" xlink:to="loc_ifrs-full_ProfitLoss_275" use="optional" order="37" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_RedemptionOtherEquityInstruments" xlink:label="loc_agn_RedemptionOtherEquityInstruments_855908" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" xlink:to="loc_agn_RedemptionOtherEquityInstruments_855908" use="optional" order="38" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_SharesWithdrawn" xlink:label="loc_agn_SharesWithdrawn_855907" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" xlink:to="loc_agn_SharesWithdrawn_855907" use="optional" order="39" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_StatementOfChangesInEquityTable" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable_255" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" xlink:to="loc_ifrs-full_StatementOfChangesInEquityTable_255" xbrldt:contextElement="scenario" xbrldt:closed="true" use="optional" order="40" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_256" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_255" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_256" use="optional" order="41" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityMember" xlink:label="loc_ifrs-full_EquityMember_257" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_256" xlink:to="loc_ifrs-full_EquityMember_257" use="optional" order="42" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_270" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_257" xlink:to="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_270" use="optional" order="43" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IssuedCapitalMember" xlink:label="loc_ifrs-full_IssuedCapitalMember_264" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_257" xlink:to="loc_ifrs-full_IssuedCapitalMember_264" use="optional" order="44" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncontrollingInterestsMember" xlink:label="loc_ifrs-full_NoncontrollingInterestsMember_271" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_257" xlink:to="loc_ifrs-full_NoncontrollingInterestsMember_271" use="optional" order="45" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherEquityInstrumentsMember" xlink:label="loc_agn_OtherEquityInstrumentsMember_269" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_257" xlink:to="loc_agn_OtherEquityInstrumentsMember_269" use="optional" order="46" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherReservesMember" xlink:label="loc_ifrs-full_OtherReservesMember_268" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_257" xlink:to="loc_ifrs-full_OtherReservesMember_268" use="optional" order="47" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ReserveOfDiscontinuedOperationsHeldForSaleMember" xlink:label="loc_agn_ReserveOfDiscontinuedOperationsHeldForSaleMember_855905" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_257" xlink:to="loc_agn_ReserveOfDiscontinuedOperationsHeldForSaleMember_855905" use="optional" order="48" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ReserveOfRemeasurementsOfDefinedBenefitPlansMember" xlink:label="loc_ifrs-full_ReserveOfRemeasurementsOfDefinedBenefitPlansMember_267" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_257" xlink:to="loc_ifrs-full_ReserveOfRemeasurementsOfDefinedBenefitPlansMember_267" use="optional" order="49" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RetainedEarningsMember" xlink:label="loc_ifrs-full_RetainedEarningsMember_265" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_257" xlink:to="loc_ifrs-full_RetainedEarningsMember_265" use="optional" order="50" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_RevaluationReserveMember" xlink:label="loc_agn_RevaluationReserveMember_266" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_257" xlink:to="loc_agn_RevaluationReserveMember_266" use="optional" order="51" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis" xlink:label="loc_ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis_258" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_255" xlink:to="loc_ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis_258" use="optional" order="52" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RestatedMember" xlink:label="loc_ifrs-full_RestatedMember_259" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis_258" xlink:to="loc_ifrs-full_RestatedMember_259" use="optional" order="53" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinancialEffectOfChangesInAccountingPolicyMember" xlink:label="loc_ifrs-full_FinancialEffectOfChangesInAccountingPolicyMember_272" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestatedMember_259" xlink:to="loc_ifrs-full_FinancialEffectOfChangesInAccountingPolicyMember_272" use="optional" order="54" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseDueToVoluntaryChangesInAccountingPolicyMember" xlink:label="loc_ifrs-full_IncreaseDecreaseDueToVoluntaryChangesInAccountingPolicyMember_876483" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestatedMember_259" xlink:to="loc_ifrs-full_IncreaseDecreaseDueToVoluntaryChangesInAccountingPolicyMember_876483" use="optional" order="55" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PreviouslyStatedMember" xlink:label="loc_ifrs-full_PreviouslyStatedMember_876657" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RestatedMember_259" xlink:to="loc_ifrs-full_PreviouslyStatedMember_876657" use="optional" order="56" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_TotalComprehensiveIncomeLoss" xlink:label="loc_agn_TotalComprehensiveIncomeLoss_289" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_260" xlink:to="loc_agn_TotalComprehensiveIncomeLoss_289" use="optional" order="57" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.aegon.com/role/ConsolidatedStatementOfChangesInEquityOfAegonLtdParenthetical">
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_StatementOfChangesInEquityLineItems" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems_860207" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DiscontinuedOperationsThatMayBeReclassifiedNetOfTax" xlink:label="loc_agn_DiscontinuedOperationsThatMayBeReclassifiedNetOfTax_860209" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_860207" xlink:to="loc_agn_DiscontinuedOperationsThatMayBeReclassifiedNetOfTax_860209" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DiscontinuedOperationsThatWillNotBeReclassified" xlink:label="loc_agn_DiscontinuedOperationsThatWillNotBeReclassified_860208" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_860207" xlink:to="loc_agn_DiscontinuedOperationsThatWillNotBeReclassified_860208" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_StatementOfChangesInEquityTable" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable_860206" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_860207" xlink:to="loc_ifrs-full_StatementOfChangesInEquityTable_860206" xbrldt:contextElement="scenario" xbrldt:closed="true" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_860210" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_860206" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_860210" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityMember" xlink:label="loc_ifrs-full_EquityMember_860211" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_860210" xlink:to="loc_ifrs-full_EquityMember_860211" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ReclassificationsFromOpeningReservesToReserveOfDiscontinuedOperationsHeldForSaleMember" xlink:label="loc_agn_ReclassificationsFromOpeningReservesToReserveOfDiscontinuedOperationsHeldForSaleMember_860212" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_860211" xlink:to="loc_agn_ReclassificationsFromOpeningReservesToReserveOfDiscontinuedOperationsHeldForSaleMember_860212" use="optional" order="6" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="https://www.esma.europa.eu/xbrl/role/cor/ifrs-dim_role-990000" />
<definitionLink xlink:type="extended" xlink:role="https://www.esma.europa.eu/xbrl/role/cor/esef_role-999999">
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Accruals" xlink:label="loc_ifrs-full_Accruals_204" />
<loc xlink:type="locator" xlink:href="https://www.esma.europa.eu/taxonomy/2022-03-24/esef_cor.xsd#esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:label="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_Accruals_204" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AcquisitionCapitalContributionsJointVenturesAndAssociates" xlink:label="loc_agn_AcquisitionCapitalContributionsJointVenturesAndAssociates_381" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_AcquisitionCapitalContributionsJointVenturesAndAssociates_381" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AcquisitionOfSubsidiariesNetOfCash" xlink:label="loc_agn_AcquisitionOfSubsidiariesNetOfCash_380" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_AcquisitionOfSubsidiariesNetOfCash_380" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AddressOfRegisteredOfficeOfEntity" xlink:label="loc_ifrs-full_AddressOfRegisteredOfficeOfEntity_807306" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AddressOfRegisteredOfficeOfEntity_807306" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentForReleaseOfCashFlowHedgingReserve" xlink:label="loc_agn_AdjustmentForReleaseOfCashFlowHedgingReserve_359" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_AdjustmentForReleaseOfCashFlowHedgingReserve_359" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentForResultsFromFinancialTransactions" xlink:label="loc_agn_AdjustmentForResultsFromFinancialTransactions_354" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_AdjustmentForResultsFromFinancialTransactions_354" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForAccruedExpensesAndOtherLiabilities" xlink:label="loc_agn_AdjustmentsForAccruedExpensesAndOtherLiabilities_364" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_AdjustmentsForAccruedExpensesAndOtherLiabilities_364" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForAccruedIncomeAndPrepayments" xlink:label="loc_agn_AdjustmentsForAccruedIncomeAndPrepayments_365" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_AdjustmentsForAccruedIncomeAndPrepayments_365" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense" xlink:label="loc_ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense_355" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForDepreciationAndAmortisationExpense_355" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:label="loc_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_356" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_356" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures" xlink:label="loc_agn_AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures_876501" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures_876501" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInRepurchaseAgreementsAndCashCollateralOnSecuritiesLent" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInRepurchaseAgreementsAndCashCollateralOnSecuritiesLent_372" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInRepurchaseAgreementsAndCashCollateralOnSecuritiesLent_372" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForInsuranceContracts" xlink:label="loc_agn_AdjustmentsForInsuranceContracts_876502" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_AdjustmentsForInsuranceContracts_876502" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForInvestmentContractsWithDiscretionaryParticipatingFeatures" xlink:label="loc_agn_AdjustmentsForInvestmentContractsWithDiscretionaryParticipatingFeatures_876503" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_AdjustmentsForInvestmentContractsWithDiscretionaryParticipatingFeatures_876503" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForInvestmentContractsWithoutDiscretionaryParticipatingFeatures" xlink:label="loc_agn_AdjustmentsForInvestmentContractsWithoutDiscretionaryParticipatingFeatures_876498" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_AdjustmentsForInvestmentContractsWithoutDiscretionaryParticipatingFeatures_876498" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForNoncashItems" xlink:label="loc_agn_AdjustmentsForNoncashItems_361" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_AdjustmentsForNoncashItems_361" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForReinsuranceContractsHeld" xlink:label="loc_agn_AdjustmentsForReinsuranceContractsHeld_876504" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_AdjustmentsForReinsuranceContractsHeld_876504" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Assets" xlink:label="loc_ifrs-full_Assets_185" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_Assets_185" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AssetsArisingFromInsuranceContracts" xlink:label="loc_ifrs-full_AssetsArisingFromInsuranceContracts_876491" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_AssetsArisingFromInsuranceContracts_876491" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AssetsArisingFromReinsuranceContracts" xlink:label="loc_agn_AssetsArisingFromReinsuranceContracts_876608" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_AssetsArisingFromReinsuranceContracts_876608" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_BasicEarningsLossPerShare" xlink:label="loc_ifrs-full_BasicEarningsLossPerShare_83" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_BasicEarningsLossPerShare_83" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_BasicEarningsLossPerShareFromContinuingOperations" xlink:label="loc_ifrs-full_BasicEarningsLossPerShareFromContinuingOperations_855889" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_BasicEarningsLossPerShareFromContinuingOperations_855889" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_BasicEarningsPerCommonShareB" xlink:label="loc_agn_BasicEarningsPerCommonShareB_84" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_BasicEarningsPerCommonShareB_84" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_BasicEarningsPerCommonShareBFromContinuingOperations" xlink:label="loc_agn_BasicEarningsPerCommonShareBFromContinuingOperations_855893" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_BasicEarningsPerCommonShareBFromContinuingOperations_855893" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Borrowings" xlink:label="loc_ifrs-full_Borrowings_198" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_Borrowings_198" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="loc_ifrs-full_CashAndCashEquivalents_173" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashAndCashEquivalents_173" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:label="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_402" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_402" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_CashFlowMovementsOnOperatingItemsNotReflectedInIncome" xlink:label="loc_agn_CashFlowMovementsOnOperatingItemsNotReflectedInIncome_374" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_CashFlowMovementsOnOperatingItemsNotReflectedInIncome_374" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_398" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_398" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_387" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_387" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_377" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_377" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ChangeInOwnershipNonControllingInterests" xlink:label="loc_agn_ChangeInOwnershipNonControllingInterests_397" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_ChangeInOwnershipNonControllingInterests_397" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ChangesInAccruals" xlink:label="loc_agn_ChangesInAccruals_366" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_ChangesInAccruals_366" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ChangesInCashFlowHedgingReserveFromInsuranceContractsIssuedOtherComprehensiveIncomeBeforeTax" xlink:label="loc_agn_ChangesInCashFlowHedgingReserveFromInsuranceContractsIssuedOtherComprehensiveIncomeBeforeTax_876595" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_ChangesInCashFlowHedgingReserveFromInsuranceContractsIssuedOtherComprehensiveIncomeBeforeTax_876595" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ChangesInCashFlowHedgingReserveOtherComprehensiveIncomeBeforeTax" xlink:label="loc_agn_ChangesInCashFlowHedgingReserveOtherComprehensiveIncomeBeforeTax_876625" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_ChangesInCashFlowHedgingReserveOtherComprehensiveIncomeBeforeTax_876625" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComprehensiveIncome" xlink:label="loc_ifrs-full_ComprehensiveIncome_128" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ComprehensiveIncome_128" use="optional" order="36" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests" xlink:label="loc_ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests_130" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests_130" use="optional" order="37" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:label="loc_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent_129" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent_129" use="optional" order="38" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CountryOfIncorporation" xlink:label="loc_ifrs-full_CountryOfIncorporation_807308" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_CountryOfIncorporation_807308" use="optional" order="39" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_CouponsOnNonCumulativeSubordinatedNotes" xlink:label="loc_agn_CouponsOnNonCumulativeSubordinatedNotes_876544" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_CouponsOnNonCumulativeSubordinatedNotes_876544" use="optional" order="40" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_CouponsOnPerpetualSecurities" xlink:label="loc_agn_CouponsOnPerpetualSecurities_295" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_CouponsOnPerpetualSecurities_295" use="optional" order="41" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_CouponsOnPerpetualSecuritiesClassifiedAsFinancingActivities" xlink:label="loc_agn_CouponsOnPerpetualSecuritiesClassifiedAsFinancingActivities_395" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_CouponsOnPerpetualSecuritiesClassifiedAsFinancingActivities_395" use="optional" order="42" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DeferredExpenses" xlink:label="loc_agn_DeferredExpenses_182" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DeferredExpenses_182" use="optional" order="43" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DeferredGains" xlink:label="loc_agn_DeferredGains_201" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DeferredGains_201" use="optional" order="44" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DeferredTaxAssets" xlink:label="loc_ifrs-full_DeferredTaxAssets_181" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DeferredTaxAssets_181" use="optional" order="45" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DeferredTaxLiabilities" xlink:label="loc_ifrs-full_DeferredTaxLiabilities_202" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DeferredTaxLiabilities_202" use="optional" order="46" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DerivativeFinancialAssets" xlink:label="loc_ifrs-full_DerivativeFinancialAssets_176" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DerivativeFinancialAssets_176" use="optional" order="47" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DerivativeFinancialLiabilities" xlink:label="loc_ifrs-full_DerivativeFinancialLiabilities_197" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DerivativeFinancialLiabilities_197" use="optional" order="48" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DescriptionOfAccountingPolicyForAssetsAndLiabilitiesRelatingToEmployeeBenefitsExplanatoryTextBlock" xlink:label="loc_agn_DescriptionOfAccountingPolicyForAssetsAndLiabilitiesRelatingToEmployeeBenefitsExplanatoryTextBlock_639" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DescriptionOfAccountingPolicyForAssetsAndLiabilitiesRelatingToEmployeeBenefitsExplanatoryTextBlock_639" use="optional" order="49" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory_819204" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory_819204" use="optional" order="50" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForContingentLiabilitiesAndContingentAssetsExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForContingentLiabilitiesAndContingentAssetsExplanatory_643" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForContingentLiabilitiesAndContingentAssetsExplanatory_643" use="optional" order="51" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory_808646" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory_808646" use="optional" order="52" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForDerecognitionOfFinancialInstrumentsExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForDerecognitionOfFinancialInstrumentsExplanatory_620" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForDerecognitionOfFinancialInstrumentsExplanatory_620" use="optional" order="53" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsAndHedgingExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsAndHedgingExplanatory_835439" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsAndHedgingExplanatory_835439" use="optional" order="54" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsExplanatory_624" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForDerivativeFinancialInstrumentsExplanatory_624" use="optional" order="55" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForDiscontinuedOperationsExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForDiscontinuedOperationsExplanatory_876589" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForDiscontinuedOperationsExplanatory_876589" use="optional" order="56" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForExpensesExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForExpensesExplanatory_876586" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForExpensesExplanatory_876586" use="optional" order="57" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory_619" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory_619" use="optional" order="58" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForFeeAndCommissionIncomeAndExpenseExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForFeeAndCommissionIncomeAndExpenseExplanatory_646" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForFeeAndCommissionIncomeAndExpenseExplanatory_646" use="optional" order="59" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForFinancialAssetsExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForFinancialAssetsExplanatory_876563" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForFinancialAssetsExplanatory_876563" use="optional" order="60" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForFinancialGuaranteesExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForFinancialGuaranteesExplanatory_876587" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForFinancialGuaranteesExplanatory_876587" use="optional" order="61" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory_876562" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory_876562" use="optional" order="62" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory_876561" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory_876561" use="optional" order="63" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory_613" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory_613" use="optional" order="64" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory_617" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory_617" use="optional" order="65" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForHedgingExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForHedgingExplanatory_625" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForHedgingExplanatory_625" use="optional" order="66" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfAssetsExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfAssetsExplanatory_632" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfAssetsExplanatory_632" use="optional" order="67" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory_649" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory_649" use="optional" order="68" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory_642" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory_642" use="optional" order="69" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForInsuranceContracts" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForInsuranceContracts_636" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForInsuranceContracts_636" use="optional" order="70" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsAndGoodwillExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsAndGoodwillExplanatory_616" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsAndGoodwillExplanatory_616" use="optional" order="71" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory_819104" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory_819104" use="optional" order="72" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DescriptionOfAccountingPolicyForInterestRevenueExplanatoryTextBlock" xlink:label="loc_agn_DescriptionOfAccountingPolicyForInterestRevenueExplanatoryTextBlock_650" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DescriptionOfAccountingPolicyForInterestRevenueExplanatoryTextBlock_650" use="optional" order="73" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates_627" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates_627" use="optional" order="74" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociatesAndJointVenturesExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociatesAndJointVenturesExplanatory_608" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociatesAndJointVenturesExplanatory_608" use="optional" order="75" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForInvestmentPropertyExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForInvestmentPropertyExplanatory_876542" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForInvestmentPropertyExplanatory_876542" use="optional" order="76" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForInvestmentsInJointVentures" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForInvestmentsInJointVentures_626" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForInvestmentsInJointVentures_626" use="optional" order="77" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory_618" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory_618" use="optional" order="78" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForIssuedCapitalExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForIssuedCapitalExplanatory_808643" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForIssuedCapitalExplanatory_808643" use="optional" order="79" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory_651" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory_651" use="optional" order="80" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleAndDiscontinuedOperationsExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleAndDiscontinuedOperationsExplanatory_876588" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleAndDiscontinuedOperationsExplanatory_876588" use="optional" order="81" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory_612" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForNoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleExplanatory_612" use="optional" order="82" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForOffsettingOfFinancialInstrumentsExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForOffsettingOfFinancialInstrumentsExplanatory_615" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForOffsettingOfFinancialInstrumentsExplanatory_615" use="optional" order="83" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForProvisionsExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForProvisionsExplanatory_638" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForProvisionsExplanatory_638" use="optional" order="84" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForReinsuranceExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForReinsuranceExplanatory_628" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForReinsuranceExplanatory_628" use="optional" order="85" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory_614" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory_614" use="optional" order="86" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory_640" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory_640" use="optional" order="87" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForSubsidiariesExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForSubsidiariesExplanatory_610" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForSubsidiariesExplanatory_610" use="optional" order="88" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory_819201" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory_819201" use="optional" order="89" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForTransactionsWithNoncontrollingInterestsExplanatory" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyForTransactionsWithNoncontrollingInterestsExplanatory_611" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyForTransactionsWithNoncontrollingInterestsExplanatory_611" use="optional" order="90" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents" xlink:label="loc_ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents_631" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents_631" use="optional" order="91" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities" xlink:label="loc_ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities_807309" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities_807309" use="optional" order="92" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DilutedEarningsLossPerShare" xlink:label="loc_ifrs-full_DilutedEarningsLossPerShare_85" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DilutedEarningsLossPerShare_85" use="optional" order="93" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DilutedEarningsLossPerShareFromContinuingOperations" xlink:label="loc_ifrs-full_DilutedEarningsLossPerShareFromContinuingOperations_855891" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DilutedEarningsLossPerShareFromContinuingOperations_855891" use="optional" order="94" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DilutedEarningsPerCommonShareB" xlink:label="loc_agn_DilutedEarningsPerCommonShareB_86" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DilutedEarningsPerCommonShareB_86" use="optional" order="95" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DilutedEarningsPerCommonShareBFromContinuingOperations" xlink:label="loc_agn_DilutedEarningsPerCommonShareBFromContinuingOperations_855894" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DilutedEarningsPerCommonShareBFromContinuingOperations_855894" use="optional" order="96" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory_539" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory_539" use="optional" order="97" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisclosureOfAccrualsExplanatoryTextBlock" xlink:label="loc_agn_DisclosureOfAccrualsExplanatoryTextBlock_876650" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DisclosureOfAccrualsExplanatoryTextBlock_876650" use="optional" order="98" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfAllowanceForCreditLossesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfAllowanceForCreditLossesExplanatory_876516" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfAllowanceForCreditLossesExplanatory_876516" use="optional" order="99" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfAuthorisationOfFinancialStatementsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfAuthorisationOfFinancialStatementsExplanatory_835424" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfAuthorisationOfFinancialStatementsExplanatory_835424" use="optional" order="100" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfBasisOfConsolidationExplanatory" xlink:label="loc_ifrs-full_DisclosureOfBasisOfConsolidationExplanatory_808640" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfBasisOfConsolidationExplanatory_808640" use="optional" order="101" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfBorrowingsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfBorrowingsExplanatory_587" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfBorrowingsExplanatory_587" use="optional" order="102" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfBusinessCombinationsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsExplanatory_819113" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfBusinessCombinationsExplanatory_819113" use="optional" order="103" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory_562" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory_562" use="optional" order="104" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCashFlowStatementExplanatory" xlink:label="loc_ifrs-full_DisclosureOfCashFlowStatementExplanatory_563" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfCashFlowStatementExplanatory_563" use="optional" order="105" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfChangesInAccountingPoliciesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfChangesInAccountingPoliciesExplanatory_835427" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfChangesInAccountingPoliciesExplanatory_835427" use="optional" order="106" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCollateralExplanatory" xlink:label="loc_ifrs-full_DisclosureOfCollateralExplanatory_835477" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfCollateralExplanatory_835477" use="optional" order="107" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory_597" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory_597" use="optional" order="108" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCommitmentsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfCommitmentsExplanatory_598" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfCommitmentsExplanatory_598" use="optional" order="109" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCompositionOfGroupExplanatory" xlink:label="loc_ifrs-full_DisclosureOfCompositionOfGroupExplanatory_819178" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfCompositionOfGroupExplanatory_819178" use="optional" order="110" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfContingentLiabilitiesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesExplanatory_599" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfContingentLiabilitiesExplanatory_599" use="optional" order="111" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCreditRiskExplanatory" xlink:label="loc_ifrs-full_DisclosureOfCreditRiskExplanatory_541" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfCreditRiskExplanatory_541" use="optional" order="112" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDebtSecuritiesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfDebtSecuritiesExplanatory_542" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfDebtSecuritiesExplanatory_542" use="optional" order="113" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisclosureOfDeferredExpensesExplanatoryTextBlock" xlink:label="loc_agn_DisclosureOfDeferredExpensesExplanatoryTextBlock_876673" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DisclosureOfDeferredExpensesExplanatoryTextBlock_876673" use="optional" order="114" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDeferredIncomeExplanatory" xlink:label="loc_ifrs-full_DisclosureOfDeferredIncomeExplanatory_876585" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfDeferredIncomeExplanatory_876585" use="optional" order="115" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDeferredTaxesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfDeferredTaxesExplanatory_590" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfDeferredTaxesExplanatory_590" use="optional" order="116" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDerivativeFinancialInstrumentsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfDerivativeFinancialInstrumentsExplanatory_567" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfDerivativeFinancialInstrumentsExplanatory_567" use="optional" order="117" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsExplanatory_819109" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsExplanatory_819109" use="optional" order="118" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDiscontinuedOperationsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfDiscontinuedOperationsExplanatory_818914" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfDiscontinuedOperationsExplanatory_818914" use="optional" order="119" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDividendsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfDividendsExplanatory_561" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfDividendsExplanatory_561" use="optional" order="120" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfEarningsPerShareExplanatory" xlink:label="loc_ifrs-full_DisclosureOfEarningsPerShareExplanatory_560" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfEarningsPerShareExplanatory_560" use="optional" order="121" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfEffectOfChangesInForeignExchangeRatesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfEffectOfChangesInForeignExchangeRatesExplanatory_819105" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfEffectOfChangesInForeignExchangeRatesExplanatory_819105" use="optional" order="122" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfEmployeeBenefitsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfEmployeeBenefitsExplanatory_589" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfEmployeeBenefitsExplanatory_589" use="optional" order="123" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory_544" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory_544" use="optional" order="124" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory" xlink:label="loc_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory_606" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory_606" use="optional" order="125" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfExpensesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfExpensesExplanatory_555" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfExpensesExplanatory_555" use="optional" order="126" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFairValueMeasurementExplanatory" xlink:label="loc_ifrs-full_DisclosureOfFairValueMeasurementExplanatory_594" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfFairValueMeasurementExplanatory_594" use="optional" order="127" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory_595" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory_595" use="optional" order="128" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFeeAndCommissionIncomeExpenseExplanatory" xlink:label="loc_ifrs-full_DisclosureOfFeeAndCommissionIncomeExpenseExplanatory_548" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfFeeAndCommissionIncomeExpenseExplanatory_548" use="optional" order="129" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFinanceIncomeExpenseExplanatory" xlink:label="loc_ifrs-full_DisclosureOfFinanceIncomeExpenseExplanatory_876590" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfFinanceIncomeExpenseExplanatory_876590" use="optional" order="130" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory_596" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory_596" use="optional" order="131" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFinancialInstrumentsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory_835478" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfFinancialInstrumentsExplanatory_835478" use="optional" order="132" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFinancialRiskManagementExplanatory" xlink:label="loc_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory_540" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfFinancialRiskManagementExplanatory_540" use="optional" order="133" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory_537" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory_537" use="optional" order="134" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfGoodwillExplanatory" xlink:label="loc_ifrs-full_DisclosureOfGoodwillExplanatory_577" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfGoodwillExplanatory_577" use="optional" order="135" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfImpairmentOfAssetsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfImpairmentOfAssetsExplanatory_556" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfImpairmentOfAssetsExplanatory_556" use="optional" order="136" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfIncomeTaxExplanatory" xlink:label="loc_ifrs-full_DisclosureOfIncomeTaxExplanatory_559" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfIncomeTaxExplanatory_559" use="optional" order="137" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory_808601" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory_808601" use="optional" order="138" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory" xlink:label="loc_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory_819190" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory_819190" use="optional" order="139" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisclosureOfInsuranceContractsReinsuranceContractsAndInvestmentContractsWithDiscretionaryParticipatingFeaturesExplanatoryTextBlock" xlink:label="loc_agn_DisclosureOfInsuranceContractsReinsuranceContractsAndInvestmentContractsWithDiscretionaryParticipatingFeaturesExplanatoryTextBlock_584" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DisclosureOfInsuranceContractsReinsuranceContractsAndInvestmentContractsWithDiscretionaryParticipatingFeaturesExplanatoryTextBlock_584" use="optional" order="140" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisclosureOfInsuranceRevenueExplanatoryTextBlock" xlink:label="loc_agn_DisclosureOfInsuranceRevenueExplanatoryTextBlock_546" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DisclosureOfInsuranceRevenueExplanatoryTextBlock_546" use="optional" order="141" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfIntangibleAssetsAndGoodwillExplanatory" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsAndGoodwillExplanatory_575" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfIntangibleAssetsAndGoodwillExplanatory_575" use="optional" order="142" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfIntangibleAssetsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsExplanatory_576" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfIntangibleAssetsExplanatory_576" use="optional" order="143" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInterestExpenseExplanatory" xlink:label="loc_ifrs-full_DisclosureOfInterestExpenseExplanatory_557" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfInterestExpenseExplanatory_557" use="optional" order="144" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisclosureOfInvestmentContractsLiabilitiesWithoutDiscretionaryParticipatingFeaturesExplanatoryTextBlock" xlink:label="loc_agn_DisclosureOfInvestmentContractsLiabilitiesWithoutDiscretionaryParticipatingFeaturesExplanatoryTextBlock_585" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DisclosureOfInvestmentContractsLiabilitiesWithoutDiscretionaryParticipatingFeaturesExplanatoryTextBlock_585" use="optional" order="145" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInvestmentPropertyExplanatory" xlink:label="loc_ifrs-full_DisclosureOfInvestmentPropertyExplanatory_565" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfInvestmentPropertyExplanatory_565" use="optional" order="146" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory" xlink:label="loc_ifrs-full_DisclosureOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory_564" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory_564" use="optional" order="147" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfIssuedCapitalExplanatory" xlink:label="loc_ifrs-full_DisclosureOfIssuedCapitalExplanatory_579" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfIssuedCapitalExplanatory_579" use="optional" order="148" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfJointVenturesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfJointVenturesExplanatory_569" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfJointVenturesExplanatory_569" use="optional" order="149" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfLeasesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfLeasesExplanatory_819193" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfLeasesExplanatory_819193" use="optional" order="150" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfLiquidityRiskExplanatory" xlink:label="loc_ifrs-full_DisclosureOfLiquidityRiskExplanatory_543" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfLiquidityRiskExplanatory_543" use="optional" order="151" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfMarketRiskExplanatory" xlink:label="loc_ifrs-full_DisclosureOfMarketRiskExplanatory_808599" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfMarketRiskExplanatory_808599" use="optional" order="152" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory" xlink:label="loc_ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory_876583" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory_876583" use="optional" order="153" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisclosureOfNetExpensesOnReinsuranceHeldExplanatoryTextBlock" xlink:label="loc_agn_DisclosureOfNetExpensesOnReinsuranceHeldExplanatoryTextBlock_549" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DisclosureOfNetExpensesOnReinsuranceHeldExplanatoryTextBlock_549" use="optional" order="154" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfNoncurrentAssetsHeldForSaleAndDiscontinuedOperationsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfNoncurrentAssetsHeldForSaleAndDiscontinuedOperationsExplanatory_876658" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfNoncurrentAssetsHeldForSaleAndDiscontinuedOperationsExplanatory_876658" use="optional" order="155" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalExplanatory" xlink:label="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalExplanatory_808625" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalExplanatory_808625" use="optional" order="156" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory_819176" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfOffsettingOfFinancialAssetsAndFinancialLiabilitiesExplanatory_819176" use="optional" order="157" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherAssetsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfOtherAssetsExplanatory_574" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfOtherAssetsExplanatory_574" use="optional" order="158" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherLiabilitiesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfOtherLiabilitiesExplanatory_591" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfOtherLiabilitiesExplanatory_591" use="optional" order="159" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisclosureOfOtherNetInvestmentResultExplanatoryTextBlock" xlink:label="loc_agn_DisclosureOfOtherNetInvestmentResultExplanatoryTextBlock_876672" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DisclosureOfOtherNetInvestmentResultExplanatoryTextBlock_876672" use="optional" order="160" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory" xlink:label="loc_ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory_558" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory_558" use="optional" order="161" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherOperatingIncomeExpenseExplanatory" xlink:label="loc_ifrs-full_DisclosureOfOtherOperatingIncomeExpenseExplanatory_551" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfOtherOperatingIncomeExpenseExplanatory_551" use="optional" order="162" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfProvisionsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfProvisionsExplanatory_588" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfProvisionsExplanatory_588" use="optional" order="163" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsExplanatory" xlink:label="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsExplanatory_808619" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsExplanatory_808619" use="optional" order="164" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfRelatedPartyExplanatory" xlink:label="loc_ifrs-full_DisclosureOfRelatedPartyExplanatory_605" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfRelatedPartyExplanatory_605" use="optional" order="165" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfReservesAndOtherEquityInterestExplanatory" xlink:label="loc_ifrs-full_DisclosureOfReservesAndOtherEquityInterestExplanatory_581" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfReservesAndOtherEquityInterestExplanatory_581" use="optional" order="166" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory" xlink:label="loc_ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory_578" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory_578" use="optional" order="167" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesExplanatory_570" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesExplanatory_570" use="optional" order="168" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory_604" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory_604" use="optional" order="169" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisclosureOfSubordinatedBorrowingsExplanatoryTextBlock" xlink:label="loc_agn_DisclosureOfSubordinatedBorrowingsExplanatoryTextBlock_582" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DisclosureOfSubordinatedBorrowingsExplanatoryTextBlock_582" use="optional" order="170" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory_819112" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory_819112" use="optional" order="171" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfTreasurySharesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfTreasurySharesExplanatory_580" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfTreasurySharesExplanatory_580" use="optional" order="172" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisclosureOfTrustPassThroughSecuritiesExplanatoryTextBlock" xlink:label="loc_agn_DisclosureOfTrustPassThroughSecuritiesExplanatoryTextBlock_876674" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DisclosureOfTrustPassThroughSecuritiesExplanatoryTextBlock_876674" use="optional" order="173" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfUnconsolidatedStructuredEntitiesExplanatory" xlink:label="loc_ifrs-full_DisclosureOfUnconsolidatedStructuredEntitiesExplanatory_808598" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DisclosureOfUnconsolidatedStructuredEntitiesExplanatory_808598" use="optional" order="174" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DiscontinuedOperationsThatMayBeReclassifiedNetOfTax" xlink:label="loc_agn_DiscontinuedOperationsThatMayBeReclassifiedNetOfTax_855899" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DiscontinuedOperationsThatMayBeReclassifiedNetOfTax_855899" use="optional" order="175" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DiscontinuedOperationsThatWillBeReclassified" xlink:label="loc_agn_DiscontinuedOperationsThatWillBeReclassified_855913" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DiscontinuedOperationsThatWillBeReclassified_855913" use="optional" order="176" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DiscontinuedOperationsThatWillNotBeReclassified" xlink:label="loc_agn_DiscontinuedOperationsThatWillNotBeReclassified_855906" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DiscontinuedOperationsThatWillNotBeReclassified_855906" use="optional" order="177" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DiscontinuedOperationsThatWillNotBeReclassifiedNetOfTax" xlink:label="loc_agn_DiscontinuedOperationsThatWillNotBeReclassifiedNetOfTax_855898" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DiscontinuedOperationsThatWillNotBeReclassifiedNetOfTax_855898" use="optional" order="178" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisposalJointVenturesAndAssociates" xlink:label="loc_agn_DisposalJointVenturesAndAssociates_385" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DisposalJointVenturesAndAssociates_385" use="optional" order="179" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisposalOfDerivativesClassifiedAsOperatingActivities" xlink:label="loc_agn_DisposalOfDerivativesClassifiedAsOperatingActivities_370" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DisposalOfDerivativesClassifiedAsOperatingActivities_370" use="optional" order="180" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisposalOfGroupAssets" xlink:label="loc_agn_DisposalOfGroupAssets_876653" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DisposalOfGroupAssets_876653" use="optional" order="181" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisposalOfInvestmentsOtherThanMoneyMarketInvestments" xlink:label="loc_agn_DisposalOfInvestmentsOtherThanMoneyMarketInvestments_369" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DisposalOfInvestmentsOtherThanMoneyMarketInvestments_369" use="optional" order="182" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DividendReceivedFromJointVenturesAndAssociates" xlink:label="loc_agn_DividendReceivedFromJointVenturesAndAssociates_386" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_DividendReceivedFromJointVenturesAndAssociates_386" use="optional" order="183" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsPaid" xlink:label="loc_ifrs-full_DividendsPaid_293" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DividendsPaid_293" use="optional" order="184" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsPaidClassifiedAsFinancingActivities" xlink:label="loc_ifrs-full_DividendsPaidClassifiedAsFinancingActivities_394" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DividendsPaidClassifiedAsFinancingActivities_394" use="optional" order="185" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsReceivedClassifiedAsOperatingActivities" xlink:label="loc_ifrs-full_DividendsReceivedClassifiedAsOperatingActivities_412" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DividendsReceivedClassifiedAsOperatingActivities_412" use="optional" order="186" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsRecognisedAsDistributionsToOwnersPerShare" xlink:label="loc_ifrs-full_DividendsRecognisedAsDistributionsToOwnersPerShare_858840" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DividendsRecognisedAsDistributionsToOwnersPerShare_858840" use="optional" order="187" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DomicileOfEntity" xlink:label="loc_ifrs-full_DomicileOfEntity_807311" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_DomicileOfEntity_807311" use="optional" order="188" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:label="loc_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_401" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_401" use="optional" order="189" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Equity" xlink:label="loc_ifrs-full_Equity_876655" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_Equity_876655" use="optional" order="190" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityAndLiabilities" xlink:label="loc_ifrs-full_EquityAndLiabilities_206" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_EquityAndLiabilities_206" use="optional" order="191" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityAttributableToOwnersOfParent" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent_188" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_EquityAttributableToOwnersOfParent_188" use="optional" order="192" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ExplanationOfChangeInNameOfReportingEntityOrOtherMeansOfIdentificationFromEndOfPrecedingReportingPeriod" xlink:label="loc_ifrs-full_ExplanationOfChangeInNameOfReportingEntityOrOtherMeansOfIdentificationFromEndOfPrecedingReportingPeriod_876553" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ExplanationOfChangeInNameOfReportingEntityOrOtherMeansOfIdentificationFromEndOfPrecedingReportingPeriod_876553" use="optional" order="193" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FeeAndCommissionIncome" xlink:label="loc_ifrs-full_FeeAndCommissionIncome_60" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_FeeAndCommissionIncome_60" use="optional" order="194" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncomeExpensesFromReinsuranceContractsHeldExcludedFromProfitOrLossBeforeTax" xlink:label="loc_ifrs-full_FinanceIncomeExpensesFromReinsuranceContractsHeldExcludedFromProfitOrLossBeforeTax_876534" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_FinanceIncomeExpensesFromReinsuranceContractsHeldExcludedFromProfitOrLossBeforeTax_876534" use="optional" order="195" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncomeExpensesFromReinsuranceContractsHeldRecognisedInProfitOrLoss" xlink:label="loc_ifrs-full_FinanceIncomeExpensesFromReinsuranceContractsHeldRecognisedInProfitOrLoss_876497" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_FinanceIncomeExpensesFromReinsuranceContractsHeldRecognisedInProfitOrLoss_876497" use="optional" order="196" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_FinancingNetInvestmentResult" xlink:label="loc_agn_FinancingNetInvestmentResult_876526" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_FinancingNetInvestmentResult_876526" use="optional" order="197" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax" xlink:label="loc_ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax_281" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_GainsLossesOnCashFlowHedgesBeforeTax_281" use="optional" order="198" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_GainsLossesOnDisposalOfFinancialAssetsMeasuredAtFVOCIMayBeReclassifiedSubsequentlyToProfitOrLoss" xlink:label="loc_agn_GainsLossesOnDisposalOfFinancialAssetsMeasuredAtFVOCIMayBeReclassifiedSubsequentlyToProfitOrLoss_876572" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_GainsLossesOnDisposalOfFinancialAssetsMeasuredAtFVOCIMayBeReclassifiedSubsequentlyToProfitOrLoss_876572" use="optional" order="199" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_GainsLossesOnFinancialAssetsFromInsuranceContractsIssuedMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax" xlink:label="loc_agn_GainsLossesOnFinancialAssetsFromInsuranceContractsIssuedMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax_876648" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_GainsLossesOnFinancialAssetsFromInsuranceContractsIssuedMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax_876648" use="optional" order="200" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_GainsLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax" xlink:label="loc_ifrs-full_GainsLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax_876571" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_GainsLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax_876571" use="optional" order="201" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_GainsLossesTransferredToIncomeStatementOnDisposalOfFinancialAssetsMeasuredAtFVOCI" xlink:label="loc_agn_GainsLossesTransferredToIncomeStatementOnDisposalOfFinancialAssetsMeasuredAtFVOCI_876605" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_GainsLossesTransferredToIncomeStatementOnDisposalOfFinancialAssetsMeasuredAtFVOCI_876605" use="optional" order="202" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ImpairmentLoss" xlink:label="loc_ifrs-full_ImpairmentLoss_855922" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ImpairmentLoss_855922" use="optional" order="203" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss" xlink:label="loc_ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_876506" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_876506" use="optional" order="204" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeArisingFromInsuranceContracts" xlink:label="loc_ifrs-full_IncomeArisingFromInsuranceContracts_58" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncomeArisingFromInsuranceContracts_58" use="optional" order="205" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeExpensesFromReinsuranceContractsHeldOtherThanFinanceIncomeExpenses" xlink:label="loc_ifrs-full_IncomeExpensesFromReinsuranceContractsHeldOtherThanFinanceIncomeExpenses_876485" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncomeExpensesFromReinsuranceContractsHeldOtherThanFinanceIncomeExpenses_876485" use="optional" order="206" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_IncomeLossBeforeTaxAndShareOfProfitLossOfAssociatesAndJointVentures" xlink:label="loc_agn_IncomeLossBeforeTaxAndShareOfProfitLossOfAssociatesAndJointVentures_75" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_IncomeLossBeforeTaxAndShareOfProfitLossOfAssociatesAndJointVentures_75" use="optional" order="207" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities" xlink:label="loc_ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_375" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_375" use="optional" order="208" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:label="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_79" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_79" use="optional" order="209" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss" xlink:label="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss_125" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss_125" use="optional" order="210" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss" xlink:label="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss_278" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLoss_278" use="optional" order="211" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxRelatingToInsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss" xlink:label="loc_ifrs-full_IncomeTaxRelatingToInsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss_876666" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncomeTaxRelatingToInsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLoss_876666" use="optional" order="212" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xlink:label="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_399" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_399" use="optional" order="213" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary_384" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary_384" use="optional" order="214" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_296" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_296" use="optional" order="215" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners_297" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners_297" use="optional" order="216" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InsuranceFinanceIncomeExpenses" xlink:label="loc_ifrs-full_InsuranceFinanceIncomeExpenses_876495" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InsuranceFinanceIncomeExpenses_876495" use="optional" order="217" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedExcludedFromProfitOrLossThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:label="loc_ifrs-full_InsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedExcludedFromProfitOrLossThatWillBeReclassifiedToProfitOrLossBeforeTax_876532" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedExcludedFromProfitOrLossThatWillBeReclassifiedToProfitOrLossBeforeTax_876532" use="optional" order="218" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InsuranceImpairmentLossesReversals" xlink:label="loc_agn_InsuranceImpairmentLossesReversals_876512" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_InsuranceImpairmentLossesReversals_876512" use="optional" order="219" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InsuranceInterestExpenses" xlink:label="loc_agn_InsuranceInterestExpenses_876584" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_InsuranceInterestExpenses_876584" use="optional" order="220" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InsuranceInterestRevenueOnFinancialInstrumentsMeasuredAtFVPL" xlink:label="loc_agn_InsuranceInterestRevenueOnFinancialInstrumentsMeasuredAtFVPL_876509" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_InsuranceInterestRevenueOnFinancialInstrumentsMeasuredAtFVPL_876509" use="optional" order="221" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InsuranceNetInvestmentResult" xlink:label="loc_agn_InsuranceNetInvestmentResult_876513" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_InsuranceNetInvestmentResult_876513" use="optional" order="222" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InsuranceOtherInvestmentIncome" xlink:label="loc_agn_InsuranceOtherInvestmentIncome_876599" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_InsuranceOtherInvestmentIncome_876599" use="optional" order="223" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InsuranceResultsFromFinancialTransactions" xlink:label="loc_agn_InsuranceResultsFromFinancialTransactions_876510" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_InsuranceResultsFromFinancialTransactions_876510" use="optional" order="224" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InsuranceServiceExpensesFromInsuranceContractsIssued" xlink:label="loc_ifrs-full_InsuranceServiceExpensesFromInsuranceContractsIssued_876484" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InsuranceServiceExpensesFromInsuranceContractsIssued_876484" use="optional" order="225" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InsuranceServiceResult" xlink:label="loc_ifrs-full_InsuranceServiceResult_876486" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InsuranceServiceResult_876486" use="optional" order="226" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IntangibleAssetsAndGoodwill" xlink:label="loc_ifrs-full_IntangibleAssetsAndGoodwill_184" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IntangibleAssetsAndGoodwill_184" use="optional" order="227" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InterestCharges" xlink:label="loc_agn_InterestCharges_876529" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_InterestCharges_876529" use="optional" order="228" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestExpense" xlink:label="loc_ifrs-full_InterestExpense_876518" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InterestExpense_876518" use="optional" order="229" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestIncomeOnFinancialAssetsDesignatedAtFairValueThroughProfitOrLoss" xlink:label="loc_ifrs-full_InterestIncomeOnFinancialAssetsDesignatedAtFairValueThroughProfitOrLoss_876515" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InterestIncomeOnFinancialAssetsDesignatedAtFairValueThroughProfitOrLoss_876515" use="optional" order="230" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:label="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities_413" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities_413" use="optional" order="231" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestReceivedClassifiedAsOperatingActivities" xlink:label="loc_ifrs-full_InterestReceivedClassifiedAsOperatingActivities_411" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InterestReceivedClassifiedAsOperatingActivities_411" use="optional" order="232" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestRevenueCalculatedUsingEffectiveInterestMethod" xlink:label="loc_ifrs-full_InterestRevenueCalculatedUsingEffectiveInterestMethod_876508" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InterestRevenueCalculatedUsingEffectiveInterestMethod_876508" use="optional" order="233" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InterestRevenueOnFinancialInstrumentsCalculatedUsingTheEffectiveInterestMethod" xlink:label="loc_agn_InterestRevenueOnFinancialInstrumentsCalculatedUsingTheEffectiveInterestMethod_876514" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_InterestRevenueOnFinancialInstrumentsCalculatedUsingTheEffectiveInterestMethod_876514" use="optional" order="234" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InvestmentContractIncomeExpenses" xlink:label="loc_agn_InvestmentContractIncomeExpenses_876519" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_InvestmentContractIncomeExpenses_876519" use="optional" order="235" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures" xlink:label="loc_agn_InvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures_195" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_InvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures_195" use="optional" order="236" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InvestmentContractsWithoutDiscretionaryParticipatingFeatures" xlink:label="loc_agn_InvestmentContractsWithoutDiscretionaryParticipatingFeatures_196" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_InvestmentContractsWithoutDiscretionaryParticipatingFeatures_196" use="optional" order="237" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InvestmentsInAssociatesAccountedForUsingEquityMethod" xlink:label="loc_ifrs-full_InvestmentsInAssociatesAccountedForUsingEquityMethod_178" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InvestmentsInAssociatesAccountedForUsingEquityMethod_178" use="optional" order="238" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InvestmentsInJointVenturesAccountedForUsingEquityMethod" xlink:label="loc_ifrs-full_InvestmentsInJointVenturesAccountedForUsingEquityMethod_177" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InvestmentsInJointVenturesAccountedForUsingEquityMethod_177" use="optional" order="239" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:label="loc_ifrs-full_InvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod_174" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_InvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod_174" use="optional" order="240" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_IssuanceAndPurchaseOfTreasuryShares" xlink:label="loc_agn_IssuanceAndPurchaseOfTreasuryShares_291" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_IssuanceAndPurchaseOfTreasuryShares_291" use="optional" order="241" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IssueOfEquity" xlink:label="loc_ifrs-full_IssueOfEquity_290" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_IssueOfEquity_290" use="optional" order="242" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_LegalFormOfEntity" xlink:label="loc_ifrs-full_LegalFormOfEntity_807312" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_LegalFormOfEntity_807312" use="optional" order="243" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Liabilities" xlink:label="loc_ifrs-full_Liabilities_205" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_Liabilities_205" use="optional" order="244" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_LiabilitiesArisingFromInsuranceContracts" xlink:label="loc_ifrs-full_LiabilitiesArisingFromInsuranceContracts_876612" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_LiabilitiesArisingFromInsuranceContracts_876612" use="optional" order="245" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_LiabilitiesThatAriseFromReinsuranceContracts" xlink:label="loc_agn_LiabilitiesThatAriseFromReinsuranceContracts_876611" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_LiabilitiesThatAriseFromReinsuranceContracts_876611" use="optional" order="246" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_MiscellaneousOtherOperatingExpense" xlink:label="loc_ifrs-full_MiscellaneousOtherOperatingExpense_876488" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_MiscellaneousOtherOperatingExpense_876488" use="optional" order="247" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax" xlink:label="loc_agn_MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax_282" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax_282" use="optional" order="248" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NameOfParentEntity" xlink:label="loc_ifrs-full_NameOfParentEntity_807307" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NameOfParentEntity_807307" use="optional" order="249" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification" xlink:label="loc_ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification_807304" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification_807304" use="optional" order="250" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NameOfUltimateParentOfGroup" xlink:label="loc_ifrs-full_NameOfUltimateParentOfGroup_876667" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NameOfUltimateParentOfGroup_876667" use="optional" order="251" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_NetPurchaseOfMoneyMarketInvestments" xlink:label="loc_agn_NetPurchaseOfMoneyMarketInvestments_373" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_NetPurchaseOfMoneyMarketInvestments_373" use="optional" order="252" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncontrollingInterests" xlink:label="loc_ifrs-full_NoncontrollingInterests_189" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncontrollingInterests_189" use="optional" order="253" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale" xlink:label="loc_ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale_824187" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale_824187" use="optional" order="254" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_NoncurrentLiabilitiesOrDisposalGroupsClassifiedAsHeldForSale" xlink:label="loc_agn_NoncurrentLiabilitiesOrDisposalGroupsClassifiedAsHeldForSale_876613" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_NoncurrentLiabilitiesOrDisposalGroupsClassifiedAsHeldForSale_876613" use="optional" order="255" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherAdjustmentsToReconcileProfitLoss" xlink:label="loc_ifrs-full_OtherAdjustmentsToReconcileProfitLoss_360" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherAdjustmentsToReconcileProfitLoss_360" use="optional" order="256" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherAssetsAndReceivables" xlink:label="loc_agn_OtherAssetsAndReceivables_183" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_OtherAssetsAndReceivables_183" use="optional" order="257" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncome" xlink:label="loc_ifrs-full_OtherComprehensiveIncome_127" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherComprehensiveIncome_127" use="optional" order="258" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability_876540" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability_876540" use="optional" order="259" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesFromInvestmentsInEquityInstruments" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesFromInvestmentsInEquityInstruments_876539" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesFromInvestmentsInEquityInstruments_876539" use="optional" order="260" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_277" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_277" use="optional" order="261" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRevaluation" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRevaluation_276" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxGainsLossesOnRevaluation_276" use="optional" order="262" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherComprehensiveIncomeRecognizedToGroupAssets" xlink:label="loc_agn_OtherComprehensiveIncomeRecognizedToGroupAssets_285" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_OtherComprehensiveIncomeRecognizedToGroupAssets_285" use="optional" order="263" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherEquityInstruments" xlink:label="loc_agn_OtherEquityInstruments_876609" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_OtherEquityInstruments_876609" use="optional" order="264" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherFinanceIncome" xlink:label="loc_ifrs-full_OtherFinanceIncome_876527" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherFinanceIncome_876527" use="optional" order="265" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherIncomeCharges" xlink:label="loc_agn_OtherIncomeCharges_876601" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_OtherIncomeCharges_876601" use="optional" order="266" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:label="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities_855926" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities_855926" use="optional" order="267" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities" xlink:label="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities_855928" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities_855928" use="optional" order="268" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities" xlink:label="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities_376" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities_376" use="optional" order="269" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherInvestmentIncome" xlink:label="loc_agn_OtherInvestmentIncome_876517" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_OtherInvestmentIncome_876517" use="optional" order="270" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherLiabilities" xlink:label="loc_ifrs-full_OtherLiabilities_203" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_OtherLiabilities_203" use="optional" order="271" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherNetInvestmentResult" xlink:label="loc_agn_OtherNetInvestmentResult_876524" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_OtherNetInvestmentResult_876524" use="optional" order="272" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:label="loc_agn_OtherOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax_876607" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_OtherOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax_876607" use="optional" order="273" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherResult" xlink:label="loc_agn_OtherResult_876602" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_OtherResult_876602" use="optional" order="274" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:label="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_876499" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_876499" use="optional" order="275" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PaymentsToAcquireOrRedeemEntitysShares" xlink:label="loc_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares_390" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares_390" use="optional" order="276" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PrincipalPlaceOfBusiness" xlink:label="loc_ifrs-full_PrincipalPlaceOfBusiness_807305" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_PrincipalPlaceOfBusiness_807305" use="optional" order="277" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:label="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_391" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_391" use="optional" order="278" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:label="loc_ifrs-full_ProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities_876652" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities_876652" use="optional" order="279" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:label="loc_ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_383" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_383" use="optional" order="280" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLoss" xlink:label="loc_ifrs-full_ProfitLoss_876646" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLoss_876646" use="optional" order="281" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:label="loc_ifrs-full_ProfitLossAttributableToNoncontrollingInterests_82" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLossAttributableToNoncontrollingInterests_82" use="optional" order="282" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:label="loc_ifrs-full_ProfitLossAttributableToOwnersOfParent_81" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLossAttributableToOwnersOfParent_81" use="optional" order="283" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossBeforeTax" xlink:label="loc_ifrs-full_ProfitLossBeforeTax_819250" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLossBeforeTax_819250" use="optional" order="284" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ProfitLossBeforeTaxFromContinuingOperations" xlink:label="loc_agn_ProfitLossBeforeTaxFromContinuingOperations_819351" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_ProfitLossBeforeTaxFromContinuingOperations_819351" use="optional" order="285" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ProfitLossBeforeTaxFromDiscontinuedOperations" xlink:label="loc_agn_ProfitLossBeforeTaxFromDiscontinuedOperations_855921" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_ProfitLossBeforeTaxFromDiscontinuedOperations_855921" use="optional" order="286" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossFromContinuingOperations" xlink:label="loc_ifrs-full_ProfitLossFromContinuingOperations_80" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLossFromContinuingOperations_80" use="optional" order="287" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossFromDiscontinuedOperations" xlink:label="loc_ifrs-full_ProfitLossFromDiscontinuedOperations_818882" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ProfitLossFromDiscontinuedOperations_818882" use="optional" order="288" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Provisions" xlink:label="loc_ifrs-full_Provisions_199" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_Provisions_199" use="optional" order="289" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_PurchaseOfDerivativesClassifiedAsOperatingActivities" xlink:label="loc_agn_PurchaseOfDerivativesClassifiedAsOperatingActivities_368" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_PurchaseOfDerivativesClassifiedAsOperatingActivities_368" use="optional" order="290" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:label="loc_ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities_378" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities_378" use="optional" order="291" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_PurchaseOfInvestmentsOtherThanMoneyMarketInvestments" xlink:label="loc_agn_PurchaseOfInvestmentsOtherThanMoneyMarketInvestments_367" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_PurchaseOfInvestmentsOtherThanMoneyMarketInvestments_367" use="optional" order="292" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:label="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_379" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_379" use="optional" order="293" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RecognisedAssetsDefinedBenefitPlan" xlink:label="loc_ifrs-full_RecognisedAssetsDefinedBenefitPlan_180" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_RecognisedAssetsDefinedBenefitPlan_180" use="optional" order="294" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RecognisedLiabilitiesDefinedBenefitPlan" xlink:label="loc_ifrs-full_RecognisedLiabilitiesDefinedBenefitPlan_200" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_RecognisedLiabilitiesDefinedBenefitPlan_200" use="optional" order="295" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_RedemptionOtherEquityInstruments" xlink:label="loc_agn_RedemptionOtherEquityInstruments_855908" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_RedemptionOtherEquityInstruments_855908" use="optional" order="296" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ReimbursementRightsAtFairValue" xlink:label="loc_ifrs-full_ReimbursementRightsAtFairValue_876651" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ReimbursementRightsAtFairValue_876651" use="optional" order="297" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_RepaymentOfPerpetuals" xlink:label="loc_agn_RepaymentOfPerpetuals_392" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_RepaymentOfPerpetuals_392" use="optional" order="298" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:label="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_393" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_393" use="optional" order="299" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ResultsFromFinancialTransactions" xlink:label="loc_agn_ResultsFromFinancialTransactions_64" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_ResultsFromFinancialTransactions_64" use="optional" order="300" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ShareholdersEquity" xlink:label="loc_agn_ShareholdersEquity_186" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_ShareholdersEquity_186" use="optional" order="301" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ShareInProfitLossOfAssociates" xlink:label="loc_agn_ShareInProfitLossOfAssociates_819352" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_ShareInProfitLossOfAssociates_819352" use="optional" order="302" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ShareInProfitLossOfJointVentures" xlink:label="loc_agn_ShareInProfitLossOfJointVentures_819353" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_ShareInProfitLossOfJointVentures_819353" use="optional" order="303" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ShareOfOtherComprehensiveIncomeOfAssociatesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:label="loc_agn_ShareOfOtherComprehensiveIncomeOfAssociatesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax_284" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_ShareOfOtherComprehensiveIncomeOfAssociatesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax_284" use="optional" order="304" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ShareOfOtherComprehensiveIncomeOfJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:label="loc_agn_ShareOfOtherComprehensiveIncomeOfJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax_283" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_ShareOfOtherComprehensiveIncomeOfJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax_283" use="optional" order="305" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xlink:label="loc_ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod_818952" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod_818952" use="optional" order="306" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod" xlink:label="loc_ifrs-full_ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod_818953" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod_818953" use="optional" order="307" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_SharesWithdrawn" xlink:label="loc_agn_SharesWithdrawn_855907" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_SharesWithdrawn_855907" use="optional" order="308" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_StatementOfIFRSCompliance" xlink:label="loc_ifrs-full_StatementOfIFRSCompliance_835422" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_ifrs-full_StatementOfIFRSCompliance_835422" use="optional" order="309" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_SubordinatedBorrowings" xlink:label="loc_agn_SubordinatedBorrowings_876610" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_SubordinatedBorrowings_876610" use="optional" order="310" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_TotalComprehensiveIncomeLoss" xlink:label="loc_agn_TotalComprehensiveIncomeLoss_289" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_TotalComprehensiveIncomeLoss_289" use="optional" order="311" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_TotalNetInvestmentResult" xlink:label="loc_agn_TotalNetInvestmentResult_876528" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_TotalNetInvestmentResult_876528" use="optional" order="312" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_TotalOtherComprehensiveIncomeLoss" xlink:label="loc_agn_TotalOtherComprehensiveIncomeLoss_876676" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_TotalOtherComprehensiveIncomeLoss_876676" use="optional" order="313" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_TrustPassThroughSecurities" xlink:label="loc_agn_TrustPassThroughSecurities_192" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder" xlink:to="loc_agn_TrustPassThroughSecurities_192" use="optional" order="314" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.aegon.com/role/Anchoring">
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:label="CashFlowsFromUsedInFinancingActivities" xlink:title="CashFlowsFromUsedInFinancingActivities" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ChangeInOwnershipNonControllingInterests" xlink:label="ChangeInOwnershipNonControllingInterests" xlink:title="ChangeInOwnershipNonControllingInterests" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInFinancingActivities" xlink:to="ChangeInOwnershipNonControllingInterests" xlink:title="definition: CashFlowsFromUsedInFinancingActivities to ChangeInOwnershipNonControllingInterests" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:label="IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:title="IncreaseDecreaseThroughTransfersAndOtherChangesEquity" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_CouponsOnPerpetualSecurities" xlink:label="CouponsOnPerpetualSecurities" xlink:title="CouponsOnPerpetualSecurities" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:to="CouponsOnPerpetualSecurities" xlink:title="definition: IncreaseDecreaseThroughTransfersAndOtherChangesEquity to CouponsOnPerpetualSecurities" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestPaidClassifiedAsFinancingActivities" xlink:label="InterestPaidClassifiedAsFinancingActivities" xlink:title="InterestPaidClassifiedAsFinancingActivities" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_CouponsOnPerpetualSecuritiesClassifiedAsFinancingActivities" xlink:label="CouponsOnPerpetualSecuritiesClassifiedAsFinancingActivities" xlink:title="CouponsOnPerpetualSecuritiesClassifiedAsFinancingActivities" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="InterestPaidClassifiedAsFinancingActivities" xlink:to="CouponsOnPerpetualSecuritiesClassifiedAsFinancingActivities" xlink:title="definition: InterestPaidClassifiedAsFinancingActivities to CouponsOnPerpetualSecuritiesClassifiedAsFinancingActivities" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:label="ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:title="ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisposalJointVenturesAndAssociates" xlink:label="DisposalJointVenturesAndAssociates" xlink:title="DisposalJointVenturesAndAssociates" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod" xlink:to="DisposalJointVenturesAndAssociates" xlink:title="definition: ProceedsFromSalesOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethod to DisposalJointVenturesAndAssociates" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherCashReceiptsFromSalesOfInterestsInJointVenturesClassifiedAsInvestingActivities" xlink:label="OtherCashReceiptsFromSalesOfInterestsInJointVenturesClassifiedAsInvestingActivities" xlink:title="OtherCashReceiptsFromSalesOfInterestsInJointVenturesClassifiedAsInvestingActivities" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="DisposalJointVenturesAndAssociates" xlink:to="OtherCashReceiptsFromSalesOfInterestsInJointVenturesClassifiedAsInvestingActivities" xlink:title="definition: DisposalJointVenturesAndAssociates to OtherCashReceiptsFromSalesOfInterestsInJointVenturesClassifiedAsInvestingActivities" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromSalesOfInterestsInAssociates" xlink:label="ProceedsFromSalesOfInterestsInAssociates" xlink:title="ProceedsFromSalesOfInterestsInAssociates" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="DisposalJointVenturesAndAssociates" xlink:to="ProceedsFromSalesOfInterestsInAssociates" xlink:title="definition: DisposalJointVenturesAndAssociates to ProceedsFromSalesOfInterestsInAssociates" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncomeCost" xlink:label="FinanceIncomeCost" xlink:title="FinanceIncomeCost" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InterestCharges" xlink:label="InterestCharges" xlink:title="InterestCharges" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="FinanceIncomeCost" xlink:to="InterestCharges" xlink:title="definition: FinanceIncomeCost to InterestCharges" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RevenueFromInterest" xlink:label="RevenueFromInterest" xlink:title="RevenueFromInterest" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InterestRevenueOnFinancialInstrumentsCalculatedUsingTheEffectiveInterestMethod" xlink:label="InterestRevenueOnFinancialInstrumentsCalculatedUsingTheEffectiveInterestMethod" xlink:title="InterestRevenueOnFinancialInstrumentsCalculatedUsingTheEffectiveInterestMethod" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="RevenueFromInterest" xlink:to="InterestRevenueOnFinancialInstrumentsCalculatedUsingTheEffectiveInterestMethod" xlink:title="definition: RevenueFromInterest to InterestRevenueOnFinancialInstrumentsCalculatedUsingTheEffectiveInterestMethod" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherRevenue" xlink:label="OtherRevenue" xlink:title="OtherRevenue" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherInvestmentIncome" xlink:label="OtherInvestmentIncome" xlink:title="OtherInvestmentIncome" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherRevenue" xlink:to="OtherInvestmentIncome" xlink:title="definition: OtherRevenue to OtherInvestmentIncome" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:label="OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:title="OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_RepaymentOfPerpetuals" xlink:label="RepaymentOfPerpetuals" xlink:title="RepaymentOfPerpetuals" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities" xlink:to="RepaymentOfPerpetuals" xlink:title="definition: OtherInflowsOutflowsOfCashClassifiedAsFinancingActivities to RepaymentOfPerpetuals" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xlink:label="ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xlink:title="ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ShareInProfitLossOfAssociates" xlink:label="ShareInProfitLossOfAssociates" xlink:title="ShareInProfitLossOfAssociates" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod" xlink:to="ShareInProfitLossOfAssociates" xlink:title="definition: ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod to ShareInProfitLossOfAssociates" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod" xlink:label="ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod" xlink:title="ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ShareInProfitLossOfJointVentures" xlink:label="ShareInProfitLossOfJointVentures" xlink:title="ShareInProfitLossOfJointVentures" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod" xlink:to="ShareInProfitLossOfJointVentures" xlink:title="definition: ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod to ShareInProfitLossOfJointVentures" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInDerivativeFinancialAssets" xlink:label="AdjustmentsForDecreaseIncreaseInDerivativeFinancialAssets" xlink:title="AdjustmentsForDecreaseIncreaseInDerivativeFinancialAssets" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_PurchaseOfDerivativesClassifiedAsOperatingActivities" xlink:label="PurchaseOfDerivativesClassifiedAsOperatingActivities" xlink:title="PurchaseOfDerivativesClassifiedAsOperatingActivities" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="AdjustmentsForDecreaseIncreaseInDerivativeFinancialAssets" xlink:to="PurchaseOfDerivativesClassifiedAsOperatingActivities" xlink:title="definition: AdjustmentsForDecreaseIncreaseInDerivativeFinancialAssets to PurchaseOfDerivativesClassifiedAsOperatingActivities" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisposalOfDerivativesClassifiedAsOperatingActivities" xlink:label="DisposalOfDerivativesClassifiedAsOperatingActivities" xlink:title="DisposalOfDerivativesClassifiedAsOperatingActivities" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="AdjustmentsForDecreaseIncreaseInDerivativeFinancialAssets" xlink:to="DisposalOfDerivativesClassifiedAsOperatingActivities" xlink:title="definition: AdjustmentsForDecreaseIncreaseInDerivativeFinancialAssets to DisposalOfDerivativesClassifiedAsOperatingActivities" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:label="AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:title="AdjustmentsForDecreaseIncreaseInOtherAssets" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForAccruedIncomeAndPrepayments" xlink:label="AdjustmentsForAccruedIncomeAndPrepayments" xlink:title="AdjustmentsForAccruedIncomeAndPrepayments" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:to="AdjustmentsForAccruedIncomeAndPrepayments" xlink:title="definition: AdjustmentsForDecreaseIncreaseInOtherAssets to AdjustmentsForAccruedIncomeAndPrepayments" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ChangesInAccruals" xlink:label="ChangesInAccruals" xlink:title="ChangesInAccruals" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="AdjustmentsForDecreaseIncreaseInOtherAssets" xlink:to="ChangesInAccruals" xlink:title="definition: AdjustmentsForDecreaseIncreaseInOtherAssets to ChangesInAccruals" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Assets" xlink:label="Assets" xlink:title="Assets" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DeferredExpenses" xlink:label="DeferredExpenses" xlink:title="DeferredExpenses" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="Assets" xlink:to="DeferredExpenses" xlink:title="definition: Assets to DeferredExpenses" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherAssetsAndReceivables" xlink:label="OtherAssetsAndReceivables" xlink:title="OtherAssetsAndReceivables" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="Assets" xlink:to="OtherAssetsAndReceivables" xlink:title="definition: Assets to OtherAssetsAndReceivables" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherAssets" xlink:label="OtherAssets" xlink:title="OtherAssets" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherAssetsAndReceivables" xlink:to="OtherAssets" xlink:title="definition: OtherAssetsAndReceivables to OtherAssets" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherReceivables" xlink:label="OtherReceivables" xlink:title="OtherReceivables" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherAssetsAndReceivables" xlink:to="OtherReceivables" xlink:title="definition: OtherAssetsAndReceivables to OtherReceivables" order="2.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AssetsArisingFromReinsuranceContracts" xlink:label="AssetsArisingFromReinsuranceContracts" xlink:title="AssetsArisingFromReinsuranceContracts" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="Assets" xlink:to="AssetsArisingFromReinsuranceContracts" xlink:title="definition: Assets to AssetsArisingFromReinsuranceContracts" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_BasicEarningsLossPerShare" xlink:label="BasicEarningsLossPerShare" xlink:title="BasicEarningsLossPerShare" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_BasicEarningsPerCommonShareB" xlink:label="BasicEarningsPerCommonShareB" xlink:title="BasicEarningsPerCommonShareB" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="BasicEarningsLossPerShare" xlink:to="BasicEarningsPerCommonShareB" xlink:title="definition: BasicEarningsLossPerShare to BasicEarningsPerCommonShareB" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_BasicEarningsPerCommonShareBFromContinuingOperations" xlink:label="BasicEarningsPerCommonShareBFromContinuingOperations" xlink:title="BasicEarningsPerCommonShareBFromContinuingOperations" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="BasicEarningsLossPerShare" xlink:to="BasicEarningsPerCommonShareBFromContinuingOperations" xlink:title="definition: BasicEarningsLossPerShare to BasicEarningsPerCommonShareBFromContinuingOperations" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:label="CashFlowsFromUsedInInvestingActivities" xlink:title="CashFlowsFromUsedInInvestingActivities" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AcquisitionOfSubsidiariesNetOfCash" xlink:label="AcquisitionOfSubsidiariesNetOfCash" xlink:title="AcquisitionOfSubsidiariesNetOfCash" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInInvestingActivities" xlink:to="AcquisitionOfSubsidiariesNetOfCash" xlink:title="definition: CashFlowsFromUsedInInvestingActivities to AcquisitionOfSubsidiariesNetOfCash" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AcquisitionCapitalContributionsJointVenturesAndAssociates" xlink:label="AcquisitionCapitalContributionsJointVenturesAndAssociates" xlink:title="AcquisitionCapitalContributionsJointVenturesAndAssociates" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInInvestingActivities" xlink:to="AcquisitionCapitalContributionsJointVenturesAndAssociates" xlink:title="definition: CashFlowsFromUsedInInvestingActivities to AcquisitionCapitalContributionsJointVenturesAndAssociates" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:label="CashFlowsFromUsedInOperatingActivities" xlink:title="CashFlowsFromUsedInOperatingActivities" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentForResultsFromFinancialTransactions" xlink:label="AdjustmentForResultsFromFinancialTransactions" xlink:title="AdjustmentForResultsFromFinancialTransactions" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInOperatingActivities" xlink:to="AdjustmentForResultsFromFinancialTransactions" xlink:title="definition: CashFlowsFromUsedInOperatingActivities to AdjustmentForResultsFromFinancialTransactions" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentForReleaseOfCashFlowHedgingReserve" xlink:label="AdjustmentForReleaseOfCashFlowHedgingReserve" xlink:title="AdjustmentForReleaseOfCashFlowHedgingReserve" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInOperatingActivities" xlink:to="AdjustmentForReleaseOfCashFlowHedgingReserve" xlink:title="definition: CashFlowsFromUsedInOperatingActivities to AdjustmentForReleaseOfCashFlowHedgingReserve" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForAccruedExpensesAndOtherLiabilities" xlink:label="AdjustmentsForAccruedExpensesAndOtherLiabilities" xlink:title="AdjustmentsForAccruedExpensesAndOtherLiabilities" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInOperatingActivities" xlink:to="AdjustmentsForAccruedExpensesAndOtherLiabilities" xlink:title="definition: CashFlowsFromUsedInOperatingActivities to AdjustmentsForAccruedExpensesAndOtherLiabilities" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures" xlink:label="AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures" xlink:title="AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInOperatingActivities" xlink:to="AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures" xlink:title="definition: CashFlowsFromUsedInOperatingActivities to AdjustmentsForIncreaseDecreaseInInsuranceReinsuranceAndInvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperations" xlink:label="CashFlowsFromUsedInOperations" xlink:title="CashFlowsFromUsedInOperations" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForInsuranceContracts" xlink:label="AdjustmentsForInsuranceContracts" xlink:title="AdjustmentsForInsuranceContracts" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInOperations" xlink:to="AdjustmentsForInsuranceContracts" xlink:title="definition: CashFlowsFromUsedInOperations to AdjustmentsForInsuranceContracts" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForInvestmentContractsWithDiscretionaryParticipatingFeatures" xlink:label="AdjustmentsForInvestmentContractsWithDiscretionaryParticipatingFeatures" xlink:title="AdjustmentsForInvestmentContractsWithDiscretionaryParticipatingFeatures" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInOperations" xlink:to="AdjustmentsForInvestmentContractsWithDiscretionaryParticipatingFeatures" xlink:title="definition: CashFlowsFromUsedInOperations to AdjustmentsForInvestmentContractsWithDiscretionaryParticipatingFeatures" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForReinsuranceContractsHeld" xlink:label="AdjustmentsForReinsuranceContractsHeld" xlink:title="AdjustmentsForReinsuranceContractsHeld" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInOperations" xlink:to="AdjustmentsForReinsuranceContractsHeld" xlink:title="definition: CashFlowsFromUsedInOperations to AdjustmentsForReinsuranceContractsHeld" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_PurchaseOfInvestmentsOtherThanMoneyMarketInvestments" xlink:label="PurchaseOfInvestmentsOtherThanMoneyMarketInvestments" xlink:title="PurchaseOfInvestmentsOtherThanMoneyMarketInvestments" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInOperations" xlink:to="PurchaseOfInvestmentsOtherThanMoneyMarketInvestments" xlink:title="definition: CashFlowsFromUsedInOperations to PurchaseOfInvestmentsOtherThanMoneyMarketInvestments" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_NetPurchaseOfMoneyMarketInvestments" xlink:label="NetPurchaseOfMoneyMarketInvestments" xlink:title="NetPurchaseOfMoneyMarketInvestments" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInOperations" xlink:to="NetPurchaseOfMoneyMarketInvestments" xlink:title="definition: CashFlowsFromUsedInOperations to NetPurchaseOfMoneyMarketInvestments" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisposalOfInvestmentsOtherThanMoneyMarketInvestments" xlink:label="DisposalOfInvestmentsOtherThanMoneyMarketInvestments" xlink:title="DisposalOfInvestmentsOtherThanMoneyMarketInvestments" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInOperations" xlink:to="DisposalOfInvestmentsOtherThanMoneyMarketInvestments" xlink:title="definition: CashFlowsFromUsedInOperations to DisposalOfInvestmentsOtherThanMoneyMarketInvestments" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_AdjustmentsForInvestmentContractsWithoutDiscretionaryParticipatingFeatures" xlink:label="AdjustmentsForInvestmentContractsWithoutDiscretionaryParticipatingFeatures" xlink:title="AdjustmentsForInvestmentContractsWithoutDiscretionaryParticipatingFeatures" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInOperations" xlink:to="AdjustmentsForInvestmentContractsWithoutDiscretionaryParticipatingFeatures" xlink:title="definition: CashFlowsFromUsedInOperations to AdjustmentsForInvestmentContractsWithoutDiscretionaryParticipatingFeatures" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ChangesInEquity" xlink:label="ChangesInEquity" xlink:title="ChangesInEquity" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_SharesWithdrawn" xlink:label="SharesWithdrawn" xlink:title="SharesWithdrawn" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ChangesInEquity" xlink:to="SharesWithdrawn" xlink:title="definition: ChangesInEquity to SharesWithdrawn" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_RedemptionOtherEquityInstruments" xlink:label="RedemptionOtherEquityInstruments" xlink:title="RedemptionOtherEquityInstruments" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ChangesInEquity" xlink:to="RedemptionOtherEquityInstruments" xlink:title="definition: ChangesInEquity to RedemptionOtherEquityInstruments" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_IssuanceAndPurchaseOfTreasuryShares" xlink:label="IssuanceAndPurchaseOfTreasuryShares" xlink:title="IssuanceAndPurchaseOfTreasuryShares" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ChangesInEquity" xlink:to="IssuanceAndPurchaseOfTreasuryShares" xlink:title="definition: ChangesInEquity to IssuanceAndPurchaseOfTreasuryShares" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PurchaseOfTreasuryShares" xlink:label="PurchaseOfTreasuryShares" xlink:title="PurchaseOfTreasuryShares" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="IssuanceAndPurchaseOfTreasuryShares" xlink:to="PurchaseOfTreasuryShares" xlink:title="definition: IssuanceAndPurchaseOfTreasuryShares to PurchaseOfTreasuryShares" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_SaleOrIssueOfTreasuryShares" xlink:label="SaleOrIssueOfTreasuryShares" xlink:title="SaleOrIssueOfTreasuryShares" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="IssuanceAndPurchaseOfTreasuryShares" xlink:to="SaleOrIssueOfTreasuryShares" xlink:title="definition: IssuanceAndPurchaseOfTreasuryShares to SaleOrIssueOfTreasuryShares" order="2.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_CouponsOnNonCumulativeSubordinatedNotes" xlink:label="CouponsOnNonCumulativeSubordinatedNotes" xlink:title="CouponsOnNonCumulativeSubordinatedNotes" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ChangesInEquity" xlink:to="CouponsOnNonCumulativeSubordinatedNotes" xlink:title="definition: ChangesInEquity to CouponsOnNonCumulativeSubordinatedNotes" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DilutedEarningsLossPerShare" xlink:label="DilutedEarningsLossPerShare" xlink:title="DilutedEarningsLossPerShare" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DilutedEarningsPerCommonShareB" xlink:label="DilutedEarningsPerCommonShareB" xlink:title="DilutedEarningsPerCommonShareB" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="DilutedEarningsLossPerShare" xlink:to="DilutedEarningsPerCommonShareB" xlink:title="definition: DilutedEarningsLossPerShare to DilutedEarningsPerCommonShareB" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DilutedEarningsPerCommonShareBFromContinuingOperations" xlink:label="DilutedEarningsPerCommonShareBFromContinuingOperations" xlink:title="DilutedEarningsPerCommonShareBFromContinuingOperations" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="DilutedEarningsLossPerShare" xlink:to="DilutedEarningsPerCommonShareBFromContinuingOperations" xlink:title="definition: DilutedEarningsLossPerShare to DilutedEarningsPerCommonShareBFromContinuingOperations" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsReceivedClassifiedAsInvestingActivities" xlink:label="DividendsReceivedClassifiedAsInvestingActivities" xlink:title="DividendsReceivedClassifiedAsInvestingActivities" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DividendReceivedFromJointVenturesAndAssociates" xlink:label="DividendReceivedFromJointVenturesAndAssociates" xlink:title="DividendReceivedFromJointVenturesAndAssociates" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="DividendsReceivedClassifiedAsInvestingActivities" xlink:to="DividendReceivedFromJointVenturesAndAssociates" xlink:title="definition: DividendsReceivedClassifiedAsInvestingActivities to DividendReceivedFromJointVenturesAndAssociates" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsReceivedFromAssociatesClassifiedAsInvestingActivities" xlink:label="DividendsReceivedFromAssociatesClassifiedAsInvestingActivities" xlink:title="DividendsReceivedFromAssociatesClassifiedAsInvestingActivities" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="DividendReceivedFromJointVenturesAndAssociates" xlink:to="DividendsReceivedFromAssociatesClassifiedAsInvestingActivities" xlink:title="definition: DividendReceivedFromJointVenturesAndAssociates to DividendsReceivedFromAssociatesClassifiedAsInvestingActivities" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsReceivedFromJointVenturesClassifiedAsInvestingActivities" xlink:label="DividendsReceivedFromJointVenturesClassifiedAsInvestingActivities" xlink:title="DividendsReceivedFromJointVenturesClassifiedAsInvestingActivities" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="DividendReceivedFromJointVenturesAndAssociates" xlink:to="DividendsReceivedFromJointVenturesClassifiedAsInvestingActivities" xlink:title="definition: DividendReceivedFromJointVenturesAndAssociates to DividendsReceivedFromJointVenturesClassifiedAsInvestingActivities" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Equity" xlink:label="Equity" xlink:title="Equity" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ShareholdersEquity" xlink:label="ShareholdersEquity" xlink:title="ShareholdersEquity" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="Equity" xlink:to="ShareholdersEquity" xlink:title="definition: Equity to ShareholdersEquity" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IssuedCapital" xlink:label="IssuedCapital" xlink:title="IssuedCapital" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ShareholdersEquity" xlink:to="IssuedCapital" xlink:title="definition: ShareholdersEquity to IssuedCapital" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherReserves" xlink:label="OtherReserves" xlink:title="OtherReserves" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ShareholdersEquity" xlink:to="OtherReserves" xlink:title="definition: ShareholdersEquity to OtherReserves" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ReserveOfCashFlowHedges" xlink:label="ReserveOfCashFlowHedges" xlink:title="ReserveOfCashFlowHedges" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ShareholdersEquity" xlink:to="ReserveOfCashFlowHedges" xlink:title="definition: ShareholdersEquity to ReserveOfCashFlowHedges" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome" xlink:label="ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome" xlink:title="ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ShareholdersEquity" xlink:to="ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome" xlink:title="definition: ShareholdersEquity to ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ReserveOfRemeasurementsOfDefinedBenefitPlans" xlink:label="ReserveOfRemeasurementsOfDefinedBenefitPlans" xlink:title="ReserveOfRemeasurementsOfDefinedBenefitPlans" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ShareholdersEquity" xlink:to="ReserveOfRemeasurementsOfDefinedBenefitPlans" xlink:title="definition: ShareholdersEquity to ReserveOfRemeasurementsOfDefinedBenefitPlans" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RetainedEarnings" xlink:label="RetainedEarnings" xlink:title="RetainedEarnings" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ShareholdersEquity" xlink:to="RetainedEarnings" xlink:title="definition: ShareholdersEquity to RetainedEarnings" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RevaluationSurplus" xlink:label="RevaluationSurplus" xlink:title="RevaluationSurplus" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ShareholdersEquity" xlink:to="RevaluationSurplus" xlink:title="definition: ShareholdersEquity to RevaluationSurplus" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_SharePremium" xlink:label="SharePremium" xlink:title="SharePremium" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ShareholdersEquity" xlink:to="SharePremium" xlink:title="definition: ShareholdersEquity to SharePremium" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_TreasuryShares" xlink:label="TreasuryShares" xlink:title="TreasuryShares" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ShareholdersEquity" xlink:to="TreasuryShares" xlink:title="definition: ShareholdersEquity to TreasuryShares" order="2.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherEquityInstruments" xlink:label="OtherEquityInstruments" xlink:title="OtherEquityInstruments" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="Equity" xlink:to="OtherEquityInstruments" xlink:title="definition: Equity to OtherEquityInstruments" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Liabilities" xlink:label="Liabilities" xlink:title="Liabilities" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_TrustPassThroughSecurities" xlink:label="TrustPassThroughSecurities" xlink:title="TrustPassThroughSecurities" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="Liabilities" xlink:to="TrustPassThroughSecurities" xlink:title="definition: Liabilities to TrustPassThroughSecurities" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures" xlink:label="InvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures" xlink:title="InvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="Liabilities" xlink:to="InvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures" xlink:title="definition: Liabilities to InvestmentContractLiabilitiesWithDiscretionaryParticipatingFeatures" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InvestmentContractsWithoutDiscretionaryParticipatingFeatures" xlink:label="InvestmentContractsWithoutDiscretionaryParticipatingFeatures" xlink:title="InvestmentContractsWithoutDiscretionaryParticipatingFeatures" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="Liabilities" xlink:to="InvestmentContractsWithoutDiscretionaryParticipatingFeatures" xlink:title="definition: Liabilities to InvestmentContractsWithoutDiscretionaryParticipatingFeatures" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DeferredGains" xlink:label="DeferredGains" xlink:title="DeferredGains" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="Liabilities" xlink:to="DeferredGains" xlink:title="definition: Liabilities to DeferredGains" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_SubordinatedBorrowings" xlink:label="SubordinatedBorrowings" xlink:title="SubordinatedBorrowings" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="Liabilities" xlink:to="SubordinatedBorrowings" xlink:title="definition: Liabilities to SubordinatedBorrowings" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_LiabilitiesThatAriseFromReinsuranceContracts" xlink:label="LiabilitiesThatAriseFromReinsuranceContracts" xlink:title="LiabilitiesThatAriseFromReinsuranceContracts" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="Liabilities" xlink:to="LiabilitiesThatAriseFromReinsuranceContracts" xlink:title="definition: Liabilities to LiabilitiesThatAriseFromReinsuranceContracts" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_NoncurrentLiabilitiesOrDisposalGroupsClassifiedAsHeldForSale" xlink:label="NoncurrentLiabilitiesOrDisposalGroupsClassifiedAsHeldForSale" xlink:title="NoncurrentLiabilitiesOrDisposalGroupsClassifiedAsHeldForSale" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="Liabilities" xlink:to="NoncurrentLiabilitiesOrDisposalGroupsClassifiedAsHeldForSale" xlink:title="definition: Liabilities to NoncurrentLiabilitiesOrDisposalGroupsClassifiedAsHeldForSale" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncome" xlink:label="OtherComprehensiveIncome" xlink:title="OtherComprehensiveIncome" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:label="OtherOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:title="OtherOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncome" xlink:to="OtherOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:title="definition: OtherComprehensiveIncome to OtherOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ChangesInCashFlowHedgingReserveOtherComprehensiveIncomeBeforeTax" xlink:label="ChangesInCashFlowHedgingReserveOtherComprehensiveIncomeBeforeTax" xlink:title="ChangesInCashFlowHedgingReserveOtherComprehensiveIncomeBeforeTax" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncome" xlink:to="ChangesInCashFlowHedgingReserveOtherComprehensiveIncomeBeforeTax" xlink:title="definition: OtherComprehensiveIncome to ChangesInCashFlowHedgingReserveOtherComprehensiveIncomeBeforeTax" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_GainsLossesOnFinancialAssetsFromInsuranceContractsIssuedMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax" xlink:label="GainsLossesOnFinancialAssetsFromInsuranceContractsIssuedMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax" xlink:title="GainsLossesOnFinancialAssetsFromInsuranceContractsIssuedMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncome" xlink:to="GainsLossesOnFinancialAssetsFromInsuranceContractsIssuedMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax" xlink:title="definition: OtherComprehensiveIncome to GainsLossesOnFinancialAssetsFromInsuranceContractsIssuedMeasuredAtFairValueThroughOtherComprehensiveIncomeBeforeTax" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ChangesInCashFlowHedgingReserveFromInsuranceContractsIssuedOtherComprehensiveIncomeBeforeTax" xlink:label="ChangesInCashFlowHedgingReserveFromInsuranceContractsIssuedOtherComprehensiveIncomeBeforeTax" xlink:title="ChangesInCashFlowHedgingReserveFromInsuranceContractsIssuedOtherComprehensiveIncomeBeforeTax" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncome" xlink:to="ChangesInCashFlowHedgingReserveFromInsuranceContractsIssuedOtherComprehensiveIncomeBeforeTax" xlink:title="definition: OtherComprehensiveIncome to ChangesInCashFlowHedgingReserveFromInsuranceContractsIssuedOtherComprehensiveIncomeBeforeTax" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_GainsLossesTransferredToIncomeStatementOnDisposalOfFinancialAssetsMeasuredAtFVOCI" xlink:label="GainsLossesTransferredToIncomeStatementOnDisposalOfFinancialAssetsMeasuredAtFVOCI" xlink:title="GainsLossesTransferredToIncomeStatementOnDisposalOfFinancialAssetsMeasuredAtFVOCI" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncome" xlink:to="GainsLossesTransferredToIncomeStatementOnDisposalOfFinancialAssetsMeasuredAtFVOCI" xlink:title="definition: OtherComprehensiveIncome to GainsLossesTransferredToIncomeStatementOnDisposalOfFinancialAssetsMeasuredAtFVOCI" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:label="OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:title="OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_GainsLossesOnDisposalOfFinancialAssetsMeasuredAtFVOCIMayBeReclassifiedSubsequentlyToProfitOrLoss" xlink:label="GainsLossesOnDisposalOfFinancialAssetsMeasuredAtFVOCIMayBeReclassifiedSubsequentlyToProfitOrLoss" xlink:title="GainsLossesOnDisposalOfFinancialAssetsMeasuredAtFVOCIMayBeReclassifiedSubsequentlyToProfitOrLoss" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:to="GainsLossesOnDisposalOfFinancialAssetsMeasuredAtFVOCIMayBeReclassifiedSubsequentlyToProfitOrLoss" xlink:title="definition: OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax to GainsLossesOnDisposalOfFinancialAssetsMeasuredAtFVOCIMayBeReclassifiedSubsequentlyToProfitOrLoss" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherComprehensiveIncomeRecognizedToGroupAssets" xlink:label="OtherComprehensiveIncomeRecognizedToGroupAssets" xlink:title="OtherComprehensiveIncomeRecognizedToGroupAssets" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:to="OtherComprehensiveIncomeRecognizedToGroupAssets" xlink:title="definition: OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossBeforeTax to OtherComprehensiveIncomeRecognizedToGroupAssets" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:label="OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:title="OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax" xlink:label="MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax" xlink:title="MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:to="MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax" xlink:title="definition: OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax to MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax" xlink:label="GainsLossesOnExchangeDifferencesOnTranslationNetOfTax" xlink:title="GainsLossesOnExchangeDifferencesOnTranslationNetOfTax" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax" xlink:to="GainsLossesOnExchangeDifferencesOnTranslationNetOfTax" xlink:title="definition: MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax to GainsLossesOnExchangeDifferencesOnTranslationNetOfTax" order="2.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax" xlink:label="GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax" xlink:title="GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax" xlink:to="GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax" xlink:title="definition: MOVEMENTSonCURRENCYTranslationAndHedgesOfNetInvestmentsInForeignOperationsBeforeTax to GainsLossesOnHedgesOfNetInvestmentsInForeignOperationsNetOfTax" order="2.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DiscontinuedOperationsThatWillBeReclassified" xlink:label="DiscontinuedOperationsThatWillBeReclassified" xlink:title="DiscontinuedOperationsThatWillBeReclassified" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:to="DiscontinuedOperationsThatWillBeReclassified" xlink:title="definition: OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax to DiscontinuedOperationsThatWillBeReclassified" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DiscontinuedOperationsThatMayBeReclassifiedNetOfTax" xlink:label="DiscontinuedOperationsThatMayBeReclassifiedNetOfTax" xlink:title="DiscontinuedOperationsThatMayBeReclassifiedNetOfTax" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:to="DiscontinuedOperationsThatMayBeReclassifiedNetOfTax" xlink:title="definition: OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax to DiscontinuedOperationsThatMayBeReclassifiedNetOfTax" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:label="OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:title="OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DiscontinuedOperationsThatWillNotBeReclassifiedNetOfTax" xlink:label="DiscontinuedOperationsThatWillNotBeReclassifiedNetOfTax" xlink:title="DiscontinuedOperationsThatWillNotBeReclassifiedNetOfTax" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:to="DiscontinuedOperationsThatWillNotBeReclassifiedNetOfTax" xlink:title="definition: OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax to DiscontinuedOperationsThatWillNotBeReclassifiedNetOfTax" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DiscontinuedOperationsThatWillNotBeReclassified" xlink:label="DiscontinuedOperationsThatWillNotBeReclassified" xlink:title="DiscontinuedOperationsThatWillNotBeReclassified" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:to="DiscontinuedOperationsThatWillNotBeReclassified" xlink:title="definition: OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax to DiscontinuedOperationsThatWillNotBeReclassified" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_DisposalOfGroupAssets" xlink:label="DisposalOfGroupAssets" xlink:title="DisposalOfGroupAssets" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax" xlink:to="DisposalOfGroupAssets" xlink:title="definition: OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax to DisposalOfGroupAssets" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherOperatingIncomeExpense" xlink:label="OtherOperatingIncomeExpense" xlink:title="OtherOperatingIncomeExpense" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InsuranceOtherInvestmentIncome" xlink:label="InsuranceOtherInvestmentIncome" xlink:title="InsuranceOtherInvestmentIncome" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherOperatingIncomeExpense" xlink:to="InsuranceOtherInvestmentIncome" xlink:title="definition: OtherOperatingIncomeExpense to InsuranceOtherInvestmentIncome" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InsuranceInterestExpenses" xlink:label="InsuranceInterestExpenses" xlink:title="InsuranceInterestExpenses" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherOperatingIncomeExpense" xlink:to="InsuranceInterestExpenses" xlink:title="definition: OtherOperatingIncomeExpense to InsuranceInterestExpenses" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InvestmentContractIncomeExpenses" xlink:label="InvestmentContractIncomeExpenses" xlink:title="InvestmentContractIncomeExpenses" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherOperatingIncomeExpense" xlink:to="InvestmentContractIncomeExpenses" xlink:title="definition: OtherOperatingIncomeExpense to InvestmentContractIncomeExpenses" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InsuranceInterestRevenueOnFinancialInstrumentsMeasuredAtFVPL" xlink:label="InsuranceInterestRevenueOnFinancialInstrumentsMeasuredAtFVPL" xlink:title="InsuranceInterestRevenueOnFinancialInstrumentsMeasuredAtFVPL" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherOperatingIncomeExpense" xlink:to="InsuranceInterestRevenueOnFinancialInstrumentsMeasuredAtFVPL" xlink:title="definition: OtherOperatingIncomeExpense to InsuranceInterestRevenueOnFinancialInstrumentsMeasuredAtFVPL" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InsuranceResultsFromFinancialTransactions" xlink:label="InsuranceResultsFromFinancialTransactions" xlink:title="InsuranceResultsFromFinancialTransactions" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherOperatingIncomeExpense" xlink:to="InsuranceResultsFromFinancialTransactions" xlink:title="definition: OtherOperatingIncomeExpense to InsuranceResultsFromFinancialTransactions" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_InsuranceImpairmentLossesReversals" xlink:label="InsuranceImpairmentLossesReversals" xlink:title="InsuranceImpairmentLossesReversals" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherOperatingIncomeExpense" xlink:to="InsuranceImpairmentLossesReversals" xlink:title="definition: OtherOperatingIncomeExpense to InsuranceImpairmentLossesReversals" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossBeforeTax" xlink:label="ProfitLossBeforeTax" xlink:title="ProfitLossBeforeTax" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ProfitLossBeforeTaxFromDiscontinuedOperations" xlink:label="ProfitLossBeforeTaxFromDiscontinuedOperations" xlink:title="ProfitLossBeforeTaxFromDiscontinuedOperations" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ProfitLossBeforeTax" xlink:to="ProfitLossBeforeTaxFromDiscontinuedOperations" xlink:title="definition: ProfitLossBeforeTax to ProfitLossBeforeTaxFromDiscontinuedOperations" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ProfitLossBeforeTaxFromContinuingOperations" xlink:label="ProfitLossBeforeTaxFromContinuingOperations" xlink:title="ProfitLossBeforeTaxFromContinuingOperations" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ProfitLossBeforeTax" xlink:to="ProfitLossBeforeTaxFromContinuingOperations" xlink:title="definition: ProfitLossBeforeTax to ProfitLossBeforeTaxFromContinuingOperations" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ResultsFromFinancialTransactions" xlink:label="ResultsFromFinancialTransactions" xlink:title="ResultsFromFinancialTransactions" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ProfitLossBeforeTax" xlink:to="ResultsFromFinancialTransactions" xlink:title="definition: ProfitLossBeforeTax to ResultsFromFinancialTransactions" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_IncomeLossBeforeTaxAndShareOfProfitLossOfAssociatesAndJointVentures" xlink:label="IncomeLossBeforeTaxAndShareOfProfitLossOfAssociatesAndJointVentures" xlink:title="IncomeLossBeforeTaxAndShareOfProfitLossOfAssociatesAndJointVentures" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ProfitLossBeforeTax" xlink:to="IncomeLossBeforeTaxAndShareOfProfitLossOfAssociatesAndJointVentures" xlink:title="definition: ProfitLossBeforeTax to IncomeLossBeforeTaxAndShareOfProfitLossOfAssociatesAndJointVentures" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherNetInvestmentResult" xlink:label="OtherNetInvestmentResult" xlink:title="OtherNetInvestmentResult" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ProfitLossBeforeTax" xlink:to="OtherNetInvestmentResult" xlink:title="definition: ProfitLossBeforeTax to OtherNetInvestmentResult" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_OtherIncomeCharges" xlink:label="OtherIncomeCharges" xlink:title="OtherIncomeCharges" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ProfitLossBeforeTax" xlink:to="OtherIncomeCharges" xlink:title="definition: ProfitLossBeforeTax to OtherIncomeCharges" order="1.0" />
<loc xlink:type="locator" xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:label="ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:title="ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ShareOfOtherComprehensiveIncomeOfAssociatesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:label="ShareOfOtherComprehensiveIncomeOfAssociatesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:title="ShareOfOtherComprehensiveIncomeOfAssociatesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:to="ShareOfOtherComprehensiveIncomeOfAssociatesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:title="definition: ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax to ShareOfOtherComprehensiveIncomeOfAssociatesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" order="1.0" />
<loc xlink:type="locator" xlink:href="O4QK7KMMK83ITNTHUG69-2023-12-31.xsd#agn_ShareOfOtherComprehensiveIncomeOfJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:label="ShareOfOtherComprehensiveIncomeOfJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:title="ShareOfOtherComprehensiveIncomeOfJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:to="ShareOfOtherComprehensiveIncomeOfJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" xlink:title="definition: ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax to ShareOfOtherComprehensiveIncomeOfJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossBeforeTax" order="1.0" />
</definitionLink>
</linkbase>