<?xml version="1.0" encoding="utf-8"?>
<linkbase
  xmlns="http://www.xbrl.org/2003/linkbase"
  xmlns:xbrldt="http://xbrl.org/2005/xbrldt"
  xmlns:xbrli="http://www.xbrl.org/2003/instance"
  xmlns:xlink="http://www.w3.org/1999/xlink"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
    <roleRef
      roleURI="https://www.esma.europa.eu/xbrl/role/all/ias_1_role-610000"
      xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#roleType_ias_1_role-610000"
      xlink:type="simple"/>
    <roleRef
      roleURI="https://www.esma.europa.eu/xbrl/role/cor/esef_role-999999"
      xlink:href="https://www.esma.europa.eu/taxonomy/2022-03-24/esef_cor.xsd#esef_role-999999"
      xlink:type="simple"/>
    <roleRef
      roleURI="http://alten.com/xbrl/2022/role/Anchoring"
      xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#roleType_Anchoring"
      xlink:type="simple"/>
    <arcroleRef
      arcroleURI="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
      xlink:href="http://www.xbrl.org/lrr/arcrole/esma-arcrole-2018-11-21.xsd#wider-narrower"
      xlink:type="simple"/>
    <arcroleRef
      arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default"
      xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"
      xlink:type="simple"/>
    <arcroleRef
      arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member"
      xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"
      xlink:type="simple"/>
    <arcroleRef
      arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain"
      xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"
      xlink:type="simple"/>
    <arcroleRef
      arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
      xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"
      xlink:type="simple"/>
    <arcroleRef
      arcroleURI="http://xbrl.org/int/dim/arcrole/all"
      xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"
      xlink:type="simple"/>
    <definitionLink
      xlink:role="https://www.esma.europa.eu/xbrl/role/all/ias_1_role-610000"
      xlink:type="extended">
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_StatementOfChangesInEquityAbstract"
          xlink:label="ifrs-full_StatementOfChangesInEquityAbstract"
          xlink:type="locator"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_StatementOfChangesInEquityTable"
          xlink:label="ifrs-full_StatementOfChangesInEquityTable"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xbrldt:closed="true"
          xbrldt:contextElement="scenario"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/all"
          xlink:from="ifrs-full_StatementOfChangesInEquityAbstract"
          xlink:to="ifrs-full_StatementOfChangesInEquityTable"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComponentsOfEquityAxis"
          xlink:label="ifrs-full_ComponentsOfEquityAxis"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension"
          xlink:from="ifrs-full_StatementOfChangesInEquityTable"
          xlink:to="ifrs-full_ComponentsOfEquityAxis"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityMember"
          xlink:label="ifrs-full_EquityMember"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain"
          xlink:from="ifrs-full_ComponentsOfEquityAxis"
          xlink:to="ifrs-full_EquityMember"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember"
          xlink:label="ifrs-full_EquityAttributableToOwnersOfParentMember"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_EquityMember"
          xlink:to="ifrs-full_EquityAttributableToOwnersOfParentMember"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IssuedCapitalMember"
          xlink:label="ifrs-full_IssuedCapitalMember"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_EquityAttributableToOwnersOfParentMember"
          xlink:to="ifrs-full_IssuedCapitalMember"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_SharePremiumMember"
          xlink:label="ifrs-full_SharePremiumMember"
          xlink:type="locator"/>
        <definitionArc
          order="2"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_EquityAttributableToOwnersOfParentMember"
          xlink:to="ifrs-full_SharePremiumMember"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_MiscellaneousOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriodMember"
          xlink:label="ALT_MiscellaneousOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriodMember"
          xlink:type="locator"/>
        <definitionArc
          order="3"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_EquityAttributableToOwnersOfParentMember"
          xlink:to="ALT_MiscellaneousOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriodMember"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ReserveOfGainsAndLossesFromInvestmentsInEquityInstrumentsMember"
          xlink:label="ifrs-full_ReserveOfGainsAndLossesFromInvestmentsInEquityInstrumentsMember"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ALT_MiscellaneousOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriodMember"
          xlink:to="ifrs-full_ReserveOfGainsAndLossesFromInvestmentsInEquityInstrumentsMember"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RetainedEarningsExcludingProfitLossForReportingPeriodMember"
          xlink:label="ifrs-full_RetainedEarningsExcludingProfitLossForReportingPeriodMember"
          xlink:type="locator"/>
        <definitionArc
          order="2"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ALT_MiscellaneousOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriodMember"
          xlink:to="ifrs-full_RetainedEarningsExcludingProfitLossForReportingPeriodMember"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_TreasurySharesMember"
          xlink:label="ifrs-full_TreasurySharesMember"
          xlink:type="locator"/>
        <definitionArc
          order="4"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_EquityAttributableToOwnersOfParentMember"
          xlink:to="ifrs-full_TreasurySharesMember"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember"
          xlink:label="ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember"
          xlink:type="locator"/>
        <definitionArc
          order="5"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_EquityAttributableToOwnersOfParentMember"
          xlink:to="ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RetainedEarningsProfitLossForReportingPeriodMember"
          xlink:label="ifrs-full_RetainedEarningsProfitLossForReportingPeriodMember"
          xlink:type="locator"/>
        <definitionArc
          order="6"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_EquityAttributableToOwnersOfParentMember"
          xlink:to="ifrs-full_RetainedEarningsProfitLossForReportingPeriodMember"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncontrollingInterestsMember"
          xlink:label="ifrs-full_NoncontrollingInterestsMember"
          xlink:type="locator"/>
        <definitionArc
          order="2"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_EquityMember"
          xlink:to="ifrs-full_NoncontrollingInterestsMember"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_NonControllingInterestsOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriodMember"
          xlink:label="ALT_NonControllingInterestsOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriodMember"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_NoncontrollingInterestsMember"
          xlink:to="ALT_NonControllingInterestsOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriodMember"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_NonControllingInterestsReserveOfExchangeDifferencesOnTranslationMember"
          xlink:label="ALT_NonControllingInterestsReserveOfExchangeDifferencesOnTranslationMember"
          xlink:type="locator"/>
        <definitionArc
          order="2"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_NoncontrollingInterestsMember"
          xlink:to="ALT_NonControllingInterestsReserveOfExchangeDifferencesOnTranslationMember"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_NonControllingInterestsRetainedEarningsProfitLossForReportingPeriodMember"
          xlink:label="ALT_NonControllingInterestsRetainedEarningsProfitLossForReportingPeriodMember"
          xlink:type="locator"/>
        <definitionArc
          order="3"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_NoncontrollingInterestsMember"
          xlink:to="ALT_NonControllingInterestsRetainedEarningsProfitLossForReportingPeriodMember"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:label="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:type="locator"/>
        <definitionArc
          order="2"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityAbstract"
          xlink:to="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Equity"
          xlink:label="ifrs-full_Equity"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ifrs-full_Equity"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughAppropriationOfRetainedEarnings"
          xlink:label="ifrs-full_IncreaseDecreaseThroughAppropriationOfRetainedEarnings"
          xlink:type="locator"/>
        <definitionArc
          order="2"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ifrs-full_IncreaseDecreaseThroughAppropriationOfRetainedEarnings"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IssueOfEquity"
          xlink:label="ifrs-full_IssueOfEquity"
          xlink:type="locator"/>
        <definitionArc
          order="3"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ifrs-full_IssueOfEquity"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsPaid"
          xlink:label="ifrs-full_DividendsPaid"
          xlink:type="locator"/>
        <definitionArc
          order="4"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ifrs-full_DividendsPaid"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity"
          xlink:label="ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity"
          xlink:type="locator"/>
        <definitionArc
          order="5"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions"
          xlink:label="ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions"
          xlink:type="locator"/>
        <definitionArc
          order="6"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"
          xlink:label="ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"
          xlink:type="locator"/>
        <definitionArc
          order="7"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners"
          xlink:label="ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners"
          xlink:type="locator"/>
        <definitionArc
          order="8"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComprehensiveIncome"
          xlink:label="ifrs-full_ComprehensiveIncome"
          xlink:type="locator"/>
        <definitionArc
          order="9"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ifrs-full_ComprehensiveIncome"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl"
          xlink:label="ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl"
          xlink:type="locator"/>
        <definitionArc
          order="10"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NumberOfSharesOutstanding"
          xlink:label="ifrs-full_NumberOfSharesOutstanding"
          xlink:type="locator"/>
        <definitionArc
          order="11"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ifrs-full_NumberOfSharesOutstanding"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughIssueOfEquity"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughIssueOfEquity"
          xlink:type="locator"/>
        <definitionArc
          order="12"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughIssueOfEquity"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTreasuryShareTransactions"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTreasuryShareTransactions"
          xlink:type="locator"/>
        <definitionArc
          order="13"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTreasuryShareTransactions"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTransactionsWithOwners"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTransactionsWithOwners"
          xlink:type="locator"/>
        <definitionArc
          order="14"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTransactionsWithOwners"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NumberOfSharesIssued"
          xlink:label="ifrs-full_NumberOfSharesIssued"
          xlink:type="locator"/>
        <definitionArc
          order="15"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ifrs-full_NumberOfSharesIssued"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesIssued"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesIssued"
          xlink:type="locator"/>
        <definitionArc
          order="16"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesIssued"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesIssuedThroughTransactionsWithOwners"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesIssuedThroughTransactionsWithOwners"
          xlink:type="locator"/>
        <definitionArc
          order="17"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesIssuedThroughTransactionsWithOwners"
          xlink:type="arc"/>
    </definitionLink>
    <definitionLink
      xlink:role="https://www.esma.europa.eu/xbrl/role/cor/esef_role-999999"
      xlink:type="extended">
        <loc
          xlink:href="https://www.esma.europa.eu/taxonomy/2022-03-24/esef_cor.xsd#esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:label="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:type="locator"/>
        <loc
          xlink:href="https://www.esma.europa.eu/taxonomy/2022-03-24/esef_cor.xsd#esef_cor_NotesAccountingPoliciesAndMandatoryTags"
          xlink:label="esef_cor_NotesAccountingPoliciesAndMandatoryTags"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="esef_cor_NotesAccountingPoliciesAndMandatoryTags"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification"
          xlink:label="ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification"
          xlink:type="locator"/>
        <definitionArc
          order="2"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DomicileOfEntity"
          xlink:label="ifrs-full_DomicileOfEntity"
          xlink:type="locator"/>
        <definitionArc
          order="3"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DomicileOfEntity"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_LegalFormOfEntity"
          xlink:label="ifrs-full_LegalFormOfEntity"
          xlink:type="locator"/>
        <definitionArc
          order="4"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_LegalFormOfEntity"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CountryOfIncorporation"
          xlink:label="ifrs-full_CountryOfIncorporation"
          xlink:type="locator"/>
        <definitionArc
          order="5"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CountryOfIncorporation"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AddressOfRegisteredOfficeOfEntity"
          xlink:label="ifrs-full_AddressOfRegisteredOfficeOfEntity"
          xlink:type="locator"/>
        <definitionArc
          order="6"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_AddressOfRegisteredOfficeOfEntity"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities"
          xlink:label="ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities"
          xlink:type="locator"/>
        <definitionArc
          order="7"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_StatementOfIFRSCompliance"
          xlink:label="ifrs-full_StatementOfIFRSCompliance"
          xlink:type="locator"/>
        <definitionArc
          order="8"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_StatementOfIFRSCompliance"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ExplanationOfAssumptionAboutFutureWithSignificantRiskOfResultingInMaterialAdjustments"
          xlink:label="ifrs-full_ExplanationOfAssumptionAboutFutureWithSignificantRiskOfResultingInMaterialAdjustments"
          xlink:type="locator"/>
        <definitionArc
          order="9"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ExplanationOfAssumptionAboutFutureWithSignificantRiskOfResultingInMaterialAdjustments"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfAssetsAndLiabilitiesWithSignificantRiskOfMaterialAdjustmentExplanatory"
          xlink:label="ifrs-full_DisclosureOfAssetsAndLiabilitiesWithSignificantRiskOfMaterialAdjustmentExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="10"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfAssetsAndLiabilitiesWithSignificantRiskOfMaterialAdjustmentExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsRecognisedAsDistributionsToOwnersPerShare"
          xlink:label="ifrs-full_DividendsRecognisedAsDistributionsToOwnersPerShare"
          xlink:type="locator"/>
        <definitionArc
          order="11"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DividendsRecognisedAsDistributionsToOwnersPerShare"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare"
          xlink:label="ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare"
          xlink:type="locator"/>
        <definitionArc
          order="12"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory"
          xlink:label="ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="13"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfAccountingJudgementsAndEstimatesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfAccruedExpensesAndOtherLiabilitiesExplanatory"
          xlink:label="ifrs-full_DisclosureOfAccruedExpensesAndOtherLiabilitiesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="14"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfAccruedExpensesAndOtherLiabilitiesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfAllowanceForCreditLossesExplanatory"
          xlink:label="ifrs-full_DisclosureOfAllowanceForCreditLossesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="15"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfAllowanceForCreditLossesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesExplanatory"
          xlink:label="ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="16"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfAuditorsRemunerationExplanatory"
          xlink:label="ifrs-full_DisclosureOfAuditorsRemunerationExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="17"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfAuditorsRemunerationExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfAuthorisationOfFinancialStatementsExplanatory"
          xlink:label="ifrs-full_DisclosureOfAuthorisationOfFinancialStatementsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="18"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfAuthorisationOfFinancialStatementsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfBasisOfConsolidationExplanatory"
          xlink:label="ifrs-full_DisclosureOfBasisOfConsolidationExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="19"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfBasisOfConsolidationExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory"
          xlink:label="ifrs-full_DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="20"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfBorrowingsExplanatory"
          xlink:label="ifrs-full_DisclosureOfBorrowingsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="21"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfBorrowingsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfBusinessCombinationsExplanatory"
          xlink:label="ifrs-full_DisclosureOfBusinessCombinationsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="22"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfBusinessCombinationsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory"
          xlink:label="ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="23"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfCashAndCashEquivalentsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCashFlowStatementExplanatory"
          xlink:label="ifrs-full_DisclosureOfCashFlowStatementExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="24"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfCashFlowStatementExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfChangesInAccountingPoliciesExplanatory"
          xlink:label="ifrs-full_DisclosureOfChangesInAccountingPoliciesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="25"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfChangesInAccountingPoliciesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfChangesInAccountingPoliciesAccountingEstimatesAndErrorsExplanatory"
          xlink:label="ifrs-full_DisclosureOfChangesInAccountingPoliciesAccountingEstimatesAndErrorsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="26"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfChangesInAccountingPoliciesAccountingEstimatesAndErrorsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCommitmentsExplanatory"
          xlink:label="ifrs-full_DisclosureOfCommitmentsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="27"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfCommitmentsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory"
          xlink:label="ifrs-full_DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="28"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfContingentLiabilitiesExplanatory"
          xlink:label="ifrs-full_DisclosureOfContingentLiabilitiesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="29"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfContingentLiabilitiesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCreditRiskExplanatory"
          xlink:label="ifrs-full_DisclosureOfCreditRiskExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="30"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfCreditRiskExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDeferredIncomeExplanatory"
          xlink:label="ifrs-full_DisclosureOfDeferredIncomeExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="31"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfDeferredIncomeExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDeferredTaxesExplanatory"
          xlink:label="ifrs-full_DisclosureOfDeferredTaxesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="32"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfDeferredTaxesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDepreciationAndAmortisationExpenseExplanatory"
          xlink:label="ifrs-full_DisclosureOfDepreciationAndAmortisationExpenseExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="33"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfDepreciationAndAmortisationExpenseExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfDividendsExplanatory"
          xlink:label="ifrs-full_DisclosureOfDividendsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="34"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfDividendsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfEarningsPerShareExplanatory"
          xlink:label="ifrs-full_DisclosureOfEarningsPerShareExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="35"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfEarningsPerShareExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfEffectOfChangesInForeignExchangeRatesExplanatory"
          xlink:label="ifrs-full_DisclosureOfEffectOfChangesInForeignExchangeRatesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="36"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfEffectOfChangesInForeignExchangeRatesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfEmployeeBenefitsExplanatory"
          xlink:label="ifrs-full_DisclosureOfEmployeeBenefitsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="37"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfEmployeeBenefitsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory"
          xlink:label="ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="38"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfEntitysReportableSegmentsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory"
          xlink:label="ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="39"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfEventsAfterReportingPeriodExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfExpensesExplanatory"
          xlink:label="ifrs-full_DisclosureOfExpensesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="40"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfExpensesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfExpensesByNatureExplanatory"
          xlink:label="ifrs-full_DisclosureOfExpensesByNatureExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="41"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfExpensesByNatureExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFairValueMeasurementExplanatory"
          xlink:label="ifrs-full_DisclosureOfFairValueMeasurementExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="42"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfFairValueMeasurementExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory"
          xlink:label="ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="43"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfFairValueOfFinancialInstrumentsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFinanceCostExplanatory"
          xlink:label="ifrs-full_DisclosureOfFinanceCostExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="44"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfFinanceCostExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFinanceIncomeExpenseExplanatory"
          xlink:label="ifrs-full_DisclosureOfFinanceIncomeExpenseExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="45"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfFinanceIncomeExpenseExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFinanceIncomeExplanatory"
          xlink:label="ifrs-full_DisclosureOfFinanceIncomeExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="46"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfFinanceIncomeExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFinancialInstrumentsExplanatory"
          xlink:label="ifrs-full_DisclosureOfFinancialInstrumentsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="47"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfFinancialInstrumentsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory"
          xlink:label="ifrs-full_DisclosureOfFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="48"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfFinancialInstrumentsAtFairValueThroughProfitOrLossExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfFinancialRiskManagementExplanatory"
          xlink:label="ifrs-full_DisclosureOfFinancialRiskManagementExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="49"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfFinancialRiskManagementExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory"
          xlink:label="ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="50"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfGeneralInformationAboutFinancialStatementsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfGoodwillExplanatory"
          xlink:label="ifrs-full_DisclosureOfGoodwillExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="51"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfGoodwillExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfGovernmentGrantsExplanatory"
          xlink:label="ifrs-full_DisclosureOfGovernmentGrantsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="52"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfGovernmentGrantsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfImpairmentOfAssetsExplanatory"
          xlink:label="ifrs-full_DisclosureOfImpairmentOfAssetsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="53"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfImpairmentOfAssetsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfIncomeTaxExplanatory"
          xlink:label="ifrs-full_DisclosureOfIncomeTaxExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="54"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfIncomeTaxExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory"
          xlink:label="ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="55"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfInformationAboutEmployeesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory"
          xlink:label="ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="56"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfInformationAboutKeyManagementPersonnelExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfIntangibleAssetsExplanatory"
          xlink:label="ifrs-full_DisclosureOfIntangibleAssetsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="57"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfIntangibleAssetsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfIntangibleAssetsAndGoodwillExplanatory"
          xlink:label="ifrs-full_DisclosureOfIntangibleAssetsAndGoodwillExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="58"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfIntangibleAssetsAndGoodwillExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInterestExpenseExplanatory"
          xlink:label="ifrs-full_DisclosureOfInterestExpenseExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="59"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfInterestExpenseExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInterestIncomeExplanatory"
          xlink:label="ifrs-full_DisclosureOfInterestIncomeExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="60"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfInterestIncomeExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInterestIncomeExpenseExplanatory"
          xlink:label="ifrs-full_DisclosureOfInterestIncomeExpenseExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="61"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfInterestIncomeExpenseExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInterestsInOtherEntitiesExplanatory"
          xlink:label="ifrs-full_DisclosureOfInterestsInOtherEntitiesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="62"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfInterestsInOtherEntitiesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory"
          xlink:label="ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="63"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfInvestmentsAccountedForUsingEquityMethodExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory"
          xlink:label="ifrs-full_DisclosureOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="64"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfIssuedCapitalExplanatory"
          xlink:label="ifrs-full_DisclosureOfIssuedCapitalExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="65"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfIssuedCapitalExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfLeasesExplanatory"
          xlink:label="ifrs-full_DisclosureOfLeasesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="66"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfLeasesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfLiquidityRiskExplanatory"
          xlink:label="ifrs-full_DisclosureOfLiquidityRiskExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="67"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfLiquidityRiskExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfMarketRiskExplanatory"
          xlink:label="ifrs-full_DisclosureOfMarketRiskExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="68"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfMarketRiskExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfNoncontrollingInterestsExplanatory"
          xlink:label="ifrs-full_DisclosureOfNoncontrollingInterestsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="69"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfNoncontrollingInterestsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherAssetsExplanatory"
          xlink:label="ifrs-full_DisclosureOfOtherAssetsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="70"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfOtherAssetsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherCurrentAssetsExplanatory"
          xlink:label="ifrs-full_DisclosureOfOtherCurrentAssetsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="71"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfOtherCurrentAssetsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherCurrentLiabilitiesExplanatory"
          xlink:label="ifrs-full_DisclosureOfOtherCurrentLiabilitiesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="72"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfOtherCurrentLiabilitiesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherLiabilitiesExplanatory"
          xlink:label="ifrs-full_DisclosureOfOtherLiabilitiesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="73"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfOtherLiabilitiesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherNoncurrentAssetsExplanatory"
          xlink:label="ifrs-full_DisclosureOfOtherNoncurrentAssetsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="74"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfOtherNoncurrentAssetsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherNoncurrentLiabilitiesExplanatory"
          xlink:label="ifrs-full_DisclosureOfOtherNoncurrentLiabilitiesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="75"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfOtherNoncurrentLiabilitiesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory"
          xlink:label="ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="76"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfOtherOperatingExpenseExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherOperatingIncomeExpenseExplanatory"
          xlink:label="ifrs-full_DisclosureOfOtherOperatingIncomeExpenseExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="77"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfOtherOperatingIncomeExpenseExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherOperatingIncomeExplanatory"
          xlink:label="ifrs-full_DisclosureOfOtherOperatingIncomeExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="78"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfOtherOperatingIncomeExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfOtherProvisionsContingentLiabilitiesAndContingentAssetsExplanatory"
          xlink:label="ifrs-full_DisclosureOfOtherProvisionsContingentLiabilitiesAndContingentAssetsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="79"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfOtherProvisionsContingentLiabilitiesAndContingentAssetsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory"
          xlink:label="ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="80"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfPropertyPlantAndEquipmentExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfProvisionsExplanatory"
          xlink:label="ifrs-full_DisclosureOfProvisionsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="81"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfProvisionsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfRelatedPartyExplanatory"
          xlink:label="ifrs-full_DisclosureOfRelatedPartyExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="82"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfRelatedPartyExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfRevenueFromContractsWithCustomersExplanatory"
          xlink:label="ifrs-full_DisclosureOfRevenueFromContractsWithCustomersExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="83"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfRevenueFromContractsWithCustomersExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfResearchAndDevelopmentExpenseExplanatory"
          xlink:label="ifrs-full_DisclosureOfResearchAndDevelopmentExpenseExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="84"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfResearchAndDevelopmentExpenseExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfRestrictedCashAndCashEquivalentsExplanatory"
          xlink:label="ifrs-full_DisclosureOfRestrictedCashAndCashEquivalentsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="85"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfRestrictedCashAndCashEquivalentsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfRevenueExplanatory"
          xlink:label="ifrs-full_DisclosureOfRevenueExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="86"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfRevenueExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory"
          xlink:label="ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="87"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory"
          xlink:label="ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="88"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfSharebasedPaymentArrangementsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory"
          xlink:label="ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="89"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfTaxReceivablesAndPayablesExplanatory"
          xlink:label="ifrs-full_DisclosureOfTaxReceivablesAndPayablesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="90"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfTaxReceivablesAndPayablesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory"
          xlink:label="ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="91"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfTradeAndOtherPayablesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory"
          xlink:label="ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="92"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfTradeAndOtherReceivablesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfTreasurySharesExplanatory"
          xlink:label="ifrs-full_DisclosureOfTreasurySharesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="93"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfTreasurySharesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="94"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForBorrowingsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForBusinessCombinationsExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForBusinessCombinationsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="95"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForBusinessCombinationsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForBusinessCombinationsAndGoodwillExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForBusinessCombinationsAndGoodwillExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="96"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForBusinessCombinationsAndGoodwillExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="97"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForDepreciationExpenseExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForDepreciationExpenseExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="98"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForDepreciationExpenseExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents"
          xlink:type="locator"/>
        <definitionArc
          order="99"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="100"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForEarningsPerShareExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="101"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForEmployeeBenefitsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="102"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForFairValueMeasurementExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForFinanceCostsExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinanceCostsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="103"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForFinanceCostsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForFinanceIncomeAndCostsExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinanceIncomeAndCostsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="104"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForFinanceIncomeAndCostsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForFinancialAssetsExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinancialAssetsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="105"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForFinancialAssetsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="106"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="107"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForFinancialLiabilitiesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="108"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="109"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForGoodwillExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants"
          xlink:type="locator"/>
        <definitionArc
          order="110"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForGovernmentGrants"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfAssetsExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfAssetsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="111"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfAssetsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="112"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfFinancialAssetsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="113"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForImpairmentOfNonfinancialAssetsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="114"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForIncomeTaxExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsAndGoodwillExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsAndGoodwillExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="115"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsAndGoodwillExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="116"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForIntangibleAssetsOtherThanGoodwillExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForInterestIncomeAndExpenseExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForInterestIncomeAndExpenseExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="117"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForInterestIncomeAndExpenseExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates"
          xlink:type="locator"/>
        <definitionArc
          order="118"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociates"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociatesAndJointVenturesExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociatesAndJointVenturesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="119"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForInvestmentInAssociatesAndJointVenturesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="120"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="121"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForLeasesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="122"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForProvisionsExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForProvisionsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="123"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForProvisionsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue"
          xlink:type="locator"/>
        <definitionArc
          order="124"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForRecognitionOfRevenue"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForResearchAndDevelopmentExpenseExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForResearchAndDevelopmentExpenseExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="125"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForResearchAndDevelopmentExpenseExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="126"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForSegmentReportingExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="127"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForSubsidiariesExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForSubsidiariesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="128"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForSubsidiariesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="129"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForTradeAndOtherReceivablesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForTransactionsWithNoncontrollingInterestsExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForTransactionsWithNoncontrollingInterestsExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="130"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForTransactionsWithNoncontrollingInterestsExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DescriptionOfAccountingPolicyForTreasurySharesExplanatory"
          xlink:label="ifrs-full_DescriptionOfAccountingPolicyForTreasurySharesExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="131"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DescriptionOfAccountingPolicyForTreasurySharesExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory"
          xlink:label="ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="132"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfMaterialAccountingPolicyInformationExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DisclosureOfCompositionOfGroupExplanatory"
          xlink:label="ifrs-full_DisclosureOfCompositionOfGroupExplanatory"
          xlink:type="locator"/>
        <definitionArc
          order="133"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DisclosureOfCompositionOfGroupExplanatory"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Goodwill"
          xlink:label="ifrs-full_Goodwill"
          xlink:type="locator"/>
        <definitionArc
          order="134"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_Goodwill"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RightofuseAssets"
          xlink:label="ifrs-full_RightofuseAssets"
          xlink:type="locator"/>
        <definitionArc
          order="135"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_RightofuseAssets"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill"
          xlink:label="ifrs-full_IntangibleAssetsOtherThanGoodwill"
          xlink:type="locator"/>
        <definitionArc
          order="136"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_IntangibleAssetsOtherThanGoodwill"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PropertyPlantAndEquipment"
          xlink:label="ifrs-full_PropertyPlantAndEquipment"
          xlink:type="locator"/>
        <definitionArc
          order="137"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_PropertyPlantAndEquipment"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InvestmentsInAssociatesAccountedForUsingEquityMethod"
          xlink:label="ifrs-full_InvestmentsInAssociatesAccountedForUsingEquityMethod"
          xlink:type="locator"/>
        <definitionArc
          order="138"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_InvestmentsInAssociatesAccountedForUsingEquityMethod"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentFinancialAssets"
          xlink:label="ifrs-full_NoncurrentFinancialAssets"
          xlink:type="locator"/>
        <definitionArc
          order="139"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_NoncurrentFinancialAssets"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DeferredTaxAssets"
          xlink:label="ifrs-full_DeferredTaxAssets"
          xlink:type="locator"/>
        <definitionArc
          order="140"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DeferredTaxAssets"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentAssets"
          xlink:label="ifrs-full_NoncurrentAssets"
          xlink:type="locator"/>
        <definitionArc
          order="141"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_NoncurrentAssets"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentTradeReceivables"
          xlink:label="ifrs-full_CurrentTradeReceivables"
          xlink:type="locator"/>
        <definitionArc
          order="142"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CurrentTradeReceivables"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentContractAssets"
          xlink:label="ifrs-full_CurrentContractAssets"
          xlink:type="locator"/>
        <definitionArc
          order="143"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CurrentContractAssets"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherCurrentAssets"
          xlink:label="ifrs-full_OtherCurrentAssets"
          xlink:type="locator"/>
        <definitionArc
          order="144"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_OtherCurrentAssets"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentTaxAssetsCurrent"
          xlink:label="ifrs-full_CurrentTaxAssetsCurrent"
          xlink:type="locator"/>
        <definitionArc
          order="145"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CurrentTaxAssetsCurrent"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAndCashEquivalents"
          xlink:label="ifrs-full_CashAndCashEquivalents"
          xlink:type="locator"/>
        <definitionArc
          order="146"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CashAndCashEquivalents"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentAssets"
          xlink:label="ifrs-full_CurrentAssets"
          xlink:type="locator"/>
        <definitionArc
          order="147"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CurrentAssets"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Assets"
          xlink:label="ifrs-full_Assets"
          xlink:type="locator"/>
        <definitionArc
          order="148"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_Assets"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IssuedCapital"
          xlink:label="ifrs-full_IssuedCapital"
          xlink:type="locator"/>
        <definitionArc
          order="149"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_IssuedCapital"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_SharePremium"
          xlink:label="ifrs-full_SharePremium"
          xlink:type="locator"/>
        <definitionArc
          order="150"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_SharePremium"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_TreasurySharesOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriod"
          xlink:label="ALT_TreasurySharesOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriod"
          xlink:type="locator"/>
        <definitionArc
          order="151"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_TreasurySharesOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriod"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RetainedEarningsProfitLossForReportingPeriod"
          xlink:label="ifrs-full_RetainedEarningsProfitLossForReportingPeriod"
          xlink:type="locator"/>
        <definitionArc
          order="152"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_RetainedEarningsProfitLossForReportingPeriod"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityAttributableToOwnersOfParent"
          xlink:label="ifrs-full_EquityAttributableToOwnersOfParent"
          xlink:type="locator"/>
        <definitionArc
          order="153"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_EquityAttributableToOwnersOfParent"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncontrollingInterests"
          xlink:label="ifrs-full_NoncontrollingInterests"
          xlink:type="locator"/>
        <definitionArc
          order="154"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_NoncontrollingInterests"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Equity"
          xlink:label="ifrs-full_Equity"
          xlink:type="locator"/>
        <definitionArc
          order="155"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_Equity"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentProvisionsForEmployeeBenefits"
          xlink:label="ifrs-full_NoncurrentProvisionsForEmployeeBenefits"
          xlink:type="locator"/>
        <definitionArc
          order="156"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_NoncurrentProvisionsForEmployeeBenefits"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherLongtermProvisions"
          xlink:label="ifrs-full_OtherLongtermProvisions"
          xlink:type="locator"/>
        <definitionArc
          order="157"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_OtherLongtermProvisions"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_LongtermBorrowings"
          xlink:label="ifrs-full_LongtermBorrowings"
          xlink:type="locator"/>
        <definitionArc
          order="158"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_LongtermBorrowings"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentLeaseLiabilities"
          xlink:label="ifrs-full_NoncurrentLeaseLiabilities"
          xlink:type="locator"/>
        <definitionArc
          order="159"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_NoncurrentLeaseLiabilities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherNoncurrentLiabilities"
          xlink:label="ifrs-full_OtherNoncurrentLiabilities"
          xlink:type="locator"/>
        <definitionArc
          order="160"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_OtherNoncurrentLiabilities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DeferredTaxLiabilities"
          xlink:label="ifrs-full_DeferredTaxLiabilities"
          xlink:type="locator"/>
        <definitionArc
          order="161"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DeferredTaxLiabilities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NoncurrentLiabilities"
          xlink:label="ifrs-full_NoncurrentLiabilities"
          xlink:type="locator"/>
        <definitionArc
          order="162"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_NoncurrentLiabilities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentProvisions"
          xlink:label="ifrs-full_CurrentProvisions"
          xlink:type="locator"/>
        <definitionArc
          order="163"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CurrentProvisions"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings"
          xlink:label="ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings"
          xlink:type="locator"/>
        <definitionArc
          order="164"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentLeaseLiabilities"
          xlink:label="ifrs-full_CurrentLeaseLiabilities"
          xlink:type="locator"/>
        <definitionArc
          order="165"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CurrentLeaseLiabilities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers"
          xlink:label="ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers"
          xlink:type="locator"/>
        <definitionArc
          order="166"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherCurrentLiabilities"
          xlink:label="ifrs-full_OtherCurrentLiabilities"
          xlink:type="locator"/>
        <definitionArc
          order="167"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_OtherCurrentLiabilities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentContractLiabilities"
          xlink:label="ifrs-full_CurrentContractLiabilities"
          xlink:type="locator"/>
        <definitionArc
          order="168"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CurrentContractLiabilities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentTaxLiabilitiesCurrent"
          xlink:label="ifrs-full_CurrentTaxLiabilitiesCurrent"
          xlink:type="locator"/>
        <definitionArc
          order="169"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CurrentTaxLiabilitiesCurrent"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CurrentLiabilities"
          xlink:label="ifrs-full_CurrentLiabilities"
          xlink:type="locator"/>
        <definitionArc
          order="170"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CurrentLiabilities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityAndLiabilities"
          xlink:label="ifrs-full_EquityAndLiabilities"
          xlink:type="locator"/>
        <definitionArc
          order="171"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_EquityAndLiabilities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RevenueFromContractsWithCustomers"
          xlink:label="ifrs-full_RevenueFromContractsWithCustomers"
          xlink:type="locator"/>
        <definitionArc
          order="172"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_RevenueFromContractsWithCustomers"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_NonStockPurchasesAndSubcontractingBusiness"
          xlink:label="ALT_NonStockPurchasesAndSubcontractingBusiness"
          xlink:type="locator"/>
        <definitionArc
          order="173"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_NonStockPurchasesAndSubcontractingBusiness"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_EmployeeBenefitsExpenseExcludingExpenseFromShareBasedPaymentTransactionsWithEmployees"
          xlink:label="ALT_EmployeeBenefitsExpenseExcludingExpenseFromShareBasedPaymentTransactionsWithEmployees"
          xlink:type="locator"/>
        <definitionArc
          order="174"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_EmployeeBenefitsExpenseExcludingExpenseFromShareBasedPaymentTransactionsWithEmployees"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherExpenseByNature"
          xlink:label="ifrs-full_OtherExpenseByNature"
          xlink:type="locator"/>
        <definitionArc
          order="175"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_OtherExpenseByNature"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_TaxExpenseOtherThanIncomeTaxExpense"
          xlink:label="ifrs-full_TaxExpenseOtherThanIncomeTaxExpense"
          xlink:type="locator"/>
        <definitionArc
          order="176"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_TaxExpenseOtherThanIncomeTaxExpense"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DepreciationAndAmortisationExpense"
          xlink:label="ifrs-full_DepreciationAndAmortisationExpense"
          xlink:type="locator"/>
        <definitionArc
          order="177"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DepreciationAndAmortisationExpense"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_OtherOperatingExpensesFromOrdinaryActivities"
          xlink:label="ALT_OtherOperatingExpensesFromOrdinaryActivities"
          xlink:type="locator"/>
        <definitionArc
          order="178"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_OtherOperatingExpensesFromOrdinaryActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_OtherOperatingIncomeFromOrdinaryActivities"
          xlink:label="ALT_OtherOperatingIncomeFromOrdinaryActivities"
          xlink:type="locator"/>
        <definitionArc
          order="179"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_OtherOperatingIncomeFromOrdinaryActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_ProfitLossFromOrdinaryOperatingActivitiesBeforeShareBasedPaymentTransactions"
          xlink:label="ALT_ProfitLossFromOrdinaryOperatingActivitiesBeforeShareBasedPaymentTransactions"
          xlink:type="locator"/>
        <definitionArc
          order="180"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_ProfitLossFromOrdinaryOperatingActivitiesBeforeShareBasedPaymentTransactions"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees"
          xlink:label="ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees"
          xlink:type="locator"/>
        <definitionArc
          order="181"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_ProfitLossFromOrdinaryOperatingActivities"
          xlink:label="ALT_ProfitLossFromOrdinaryOperatingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="182"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_ProfitLossFromOrdinaryOperatingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_OtherOperatingExpensesFromNonOrdinaryActivities"
          xlink:label="ALT_OtherOperatingExpensesFromNonOrdinaryActivities"
          xlink:type="locator"/>
        <definitionArc
          order="183"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_OtherOperatingExpensesFromNonOrdinaryActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_OtherOperatingIncomeFromNonOrdinaryActivities"
          xlink:label="ALT_OtherOperatingIncomeFromNonOrdinaryActivities"
          xlink:type="locator"/>
        <definitionArc
          order="184"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_OtherOperatingIncomeFromNonOrdinaryActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_GainsLossesRecognisedWhenControlInSubsidiaryIsLost"
          xlink:label="ifrs-full_GainsLossesRecognisedWhenControlInSubsidiaryIsLost"
          xlink:type="locator"/>
        <definitionArc
          order="185"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_GainsLossesRecognisedWhenControlInSubsidiaryIsLost"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLossGoodwill"
          xlink:label="ifrs-full_ImpairmentLossRecognisedInProfitOrLossGoodwill"
          xlink:type="locator"/>
        <definitionArc
          order="186"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ImpairmentLossRecognisedInProfitOrLossGoodwill"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossFromOperatingActivities"
          xlink:label="ifrs-full_ProfitLossFromOperatingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="187"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ProfitLossFromOperatingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_CostOfNetDebt"
          xlink:label="ALT_CostOfNetDebt"
          xlink:type="locator"/>
        <definitionArc
          order="188"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_CostOfNetDebt"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherFinanceCost"
          xlink:label="ifrs-full_OtherFinanceCost"
          xlink:type="locator"/>
        <definitionArc
          order="189"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_OtherFinanceCost"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherFinanceIncome"
          xlink:label="ifrs-full_OtherFinanceIncome"
          xlink:type="locator"/>
        <definitionArc
          order="190"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_OtherFinanceIncome"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations"
          xlink:label="ifrs-full_IncomeTaxExpenseContinuingOperations"
          xlink:type="locator"/>
        <definitionArc
          order="191"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_IncomeTaxExpenseContinuingOperations"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_ProfitLossFromConsolidatedCompanies"
          xlink:label="ALT_ProfitLossFromConsolidatedCompanies"
          xlink:type="locator"/>
        <definitionArc
          order="192"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_ProfitLossFromConsolidatedCompanies"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod"
          xlink:label="ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod"
          xlink:type="locator"/>
        <definitionArc
          order="193"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ShareOfProfitLossOfAssociatesAccountedForUsingEquityMethod"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLoss"
          xlink:label="ifrs-full_ProfitLoss"
          xlink:type="locator"/>
        <definitionArc
          order="194"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ProfitLoss"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossAttributableToNoncontrollingInterests"
          xlink:label="ifrs-full_ProfitLossAttributableToNoncontrollingInterests"
          xlink:type="locator"/>
        <definitionArc
          order="195"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ProfitLossAttributableToNoncontrollingInterests"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossAttributableToOwnersOfParent"
          xlink:label="ifrs-full_ProfitLossAttributableToOwnersOfParent"
          xlink:type="locator"/>
        <definitionArc
          order="196"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ProfitLossAttributableToOwnersOfParent"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_BasicEarningsLossPerShare"
          xlink:label="ifrs-full_BasicEarningsLossPerShare"
          xlink:type="locator"/>
        <definitionArc
          order="197"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_BasicEarningsLossPerShare"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DilutedEarningsLossPerShare"
          xlink:label="ifrs-full_DilutedEarningsLossPerShare"
          xlink:type="locator"/>
        <definitionArc
          order="198"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DilutedEarningsLossPerShare"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossAttributableToOwnersOfParent"
          xlink:label="ifrs-full_ProfitLossAttributableToOwnersOfParent_1"
          xlink:type="locator"/>
        <definitionArc
          order="199"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ProfitLossAttributableToOwnersOfParent_1"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLossAttributableToNoncontrollingInterests"
          xlink:label="ifrs-full_ProfitLossAttributableToNoncontrollingInterests_1"
          xlink:type="locator"/>
        <definitionArc
          order="200"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ProfitLossAttributableToNoncontrollingInterests_1"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLoss"
          xlink:label="ifrs-full_ProfitLoss_1"
          xlink:type="locator"/>
        <definitionArc
          order="201"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ProfitLoss_1"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation"
          xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation"
          xlink:type="locator"/>
        <definitionArc
          order="202"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax"
          xlink:label="ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax"
          xlink:type="locator"/>
        <definitionArc
          order="203"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments"
          xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments"
          xlink:type="locator"/>
        <definitionArc
          order="204"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans"
          xlink:label="ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans"
          xlink:type="locator"/>
        <definitionArc
          order="205"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax"
          xlink:label="ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax"
          xlink:type="locator"/>
        <definitionArc
          order="206"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_OtherComprehensiveIncomeThatWillNotBeReclassifiedToProfitOrLossNetOfTax"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComprehensiveIncome"
          xlink:label="ifrs-full_ComprehensiveIncome"
          xlink:type="locator"/>
        <definitionArc
          order="207"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ComprehensiveIncome"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent"
          xlink:label="ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent"
          xlink:type="locator"/>
        <definitionArc
          order="208"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests"
          xlink:label="ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests"
          xlink:type="locator"/>
        <definitionArc
          order="209"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProfitLoss"
          xlink:label="ifrs-full_ProfitLoss_2"
          xlink:type="locator"/>
        <definitionArc
          order="210"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ProfitLoss_2"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForUndistributedProfitsOfAssociates"
          xlink:label="ifrs-full_AdjustmentsForUndistributedProfitsOfAssociates"
          xlink:type="locator"/>
        <definitionArc
          order="211"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_AdjustmentsForUndistributedProfitsOfAssociates"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_AdjustmentsForProvisionsAndAdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"
          xlink:label="ALT_AdjustmentsForProvisionsAndAdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"
          xlink:type="locator"/>
        <definitionArc
          order="212"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_AdjustmentsForProvisionsAndAdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForSharebasedPayments"
          xlink:label="ifrs-full_AdjustmentsForSharebasedPayments"
          xlink:type="locator"/>
        <definitionArc
          order="213"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_AdjustmentsForSharebasedPayments"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForIncomeTaxExpense"
          xlink:label="ifrs-full_AdjustmentsForIncomeTaxExpense"
          xlink:type="locator"/>
        <definitionArc
          order="214"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_AdjustmentsForIncomeTaxExpense"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets"
          xlink:label="ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets"
          xlink:type="locator"/>
        <definitionArc
          order="215"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_AdjustmentsForCostOfNetDebt"
          xlink:label="ALT_AdjustmentsForCostOfNetDebt"
          xlink:type="locator"/>
        <definitionArc
          order="216"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_AdjustmentsForCostOfNetDebt"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_AdjustmentsForFinancialProvisionsAndIncreaseArisingFromPassageOfTime"
          xlink:label="ALT_AdjustmentsForFinancialProvisionsAndIncreaseArisingFromPassageOfTime"
          xlink:type="locator"/>
        <definitionArc
          order="217"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_AdjustmentsForFinancialProvisionsAndIncreaseArisingFromPassageOfTime"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital"
          xlink:label="ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital"
          xlink:type="locator"/>
        <definitionArc
          order="218"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CashFlowsFromUsedInOperationsBeforeChangesInWorkingCapital"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities"
          xlink:label="ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="219"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseInWorkingCapital"
          xlink:label="ifrs-full_IncreaseDecreaseInWorkingCapital"
          xlink:type="locator"/>
        <definitionArc
          order="220"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_IncreaseDecreaseInWorkingCapital"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities"
          xlink:label="ifrs-full_CashFlowsFromUsedInOperatingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="221"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CashFlowsFromUsedInOperatingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_PurchaseOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:label="ALT_PurchaseOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:type="locator"/>
        <definitionArc
          order="222"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_PurchaseOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_CashAdvancesAndLoansMadeToOtherPartiesAndPurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:label="ALT_CashAdvancesAndLoansMadeToOtherPartiesAndPurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="223"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_CashAdvancesAndLoansMadeToOtherPartiesAndPurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_ImpactOfChangesInScopeAndPaymentOfContingentConsiderationClassifiedAsInvestingActivities"
          xlink:label="ALT_ImpactOfChangesInScopeAndPaymentOfContingentConsiderationClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="224"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_ImpactOfChangesInScopeAndPaymentOfContingentConsiderationClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_ProceedsFromDisposalsOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:label="ALT_ProceedsFromDisposalsOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:type="locator"/>
        <definitionArc
          order="225"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_ProceedsFromDisposalsOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_CashReceiptsFromRepaymentOfAdvancesAndLoansMadeToOtherPartiesAndProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:label="ALT_CashReceiptsFromRepaymentOfAdvancesAndLoansMadeToOtherPartiesAndProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="226"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_CashReceiptsFromRepaymentOfAdvancesAndLoansMadeToOtherPartiesAndProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"
          xlink:label="ifrs-full_CashFlowsFromUsedInInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="227"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CashFlowsFromUsedInInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_InterestPaidReceivedClassifiedAsFinancingActivities"
          xlink:label="ALT_InterestPaidReceivedClassifiedAsFinancingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="228"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_InterestPaidReceivedClassifiedAsFinancingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsPaidClassifiedAsFinancingActivities"
          xlink:label="ifrs-full_DividendsPaidClassifiedAsFinancingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="229"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DividendsPaidClassifiedAsFinancingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromIssuingShares"
          xlink:label="ifrs-full_ProceedsFromIssuingShares"
          xlink:type="locator"/>
        <definitionArc
          order="230"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ProceedsFromIssuingShares"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_PaymentsToAcquireOrRedeemEntitysSharesAndProceedsFromSaleOrIssueOfTreasuryShares"
          xlink:label="ALT_PaymentsToAcquireOrRedeemEntitysSharesAndProceedsFromSaleOrIssueOfTreasuryShares"
          xlink:type="locator"/>
        <definitionArc
          order="231"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_PaymentsToAcquireOrRedeemEntitysSharesAndProceedsFromSaleOrIssueOfTreasuryShares"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_ProceedsFromNonCurrentBorrowingsAndRepaymentsOfNonCurrentBorrowings"
          xlink:label="ALT_ProceedsFromNonCurrentBorrowingsAndRepaymentsOfNonCurrentBorrowings"
          xlink:type="locator"/>
        <definitionArc
          order="232"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_ProceedsFromNonCurrentBorrowingsAndRepaymentsOfNonCurrentBorrowings"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings"
          xlink:label="ifrs-full_CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings"
          xlink:type="locator"/>
        <definitionArc
          order="233"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CashFlowsFromUsedInIncreaseDecreaseInCurrentBorrowings"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities"
          xlink:label="ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="234"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"
          xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="235"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CashFlowsFromUsedInFinancingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges"
          xlink:label="ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges"
          xlink:type="locator"/>
        <definitionArc
          order="236"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents"
          xlink:label="ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents"
          xlink:type="locator"/>
        <definitionArc
          order="237"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAndCashEquivalents"
          xlink:label="ifrs-full_CashAndCashEquivalents_1"
          xlink:type="locator"/>
        <definitionArc
          order="238"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CashAndCashEquivalents_1"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAndCashEquivalents"
          xlink:label="ifrs-full_CashAndCashEquivalents_2"
          xlink:type="locator"/>
        <definitionArc
          order="239"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_CashAndCashEquivalents_2"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:label="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:type="locator"/>
        <definitionArc
          order="240"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_StatementOfChangesInEquityLineItems"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Equity"
          xlink:label="ifrs-full_Equity_1"
          xlink:type="locator"/>
        <definitionArc
          order="241"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_Equity_1"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughAppropriationOfRetainedEarnings"
          xlink:label="ifrs-full_IncreaseDecreaseThroughAppropriationOfRetainedEarnings"
          xlink:type="locator"/>
        <definitionArc
          order="242"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_IncreaseDecreaseThroughAppropriationOfRetainedEarnings"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IssueOfEquity"
          xlink:label="ifrs-full_IssueOfEquity"
          xlink:type="locator"/>
        <definitionArc
          order="243"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_IssueOfEquity"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_DividendsPaid"
          xlink:label="ifrs-full_DividendsPaid"
          xlink:type="locator"/>
        <definitionArc
          order="244"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_DividendsPaid"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity"
          xlink:label="ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity"
          xlink:type="locator"/>
        <definitionArc
          order="245"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions"
          xlink:label="ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions"
          xlink:type="locator"/>
        <definitionArc
          order="246"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"
          xlink:label="ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"
          xlink:type="locator"/>
        <definitionArc
          order="247"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners"
          xlink:label="ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners"
          xlink:type="locator"/>
        <definitionArc
          order="248"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_IncreaseDecreaseThroughTransactionsWithOwners"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ComprehensiveIncome"
          xlink:label="ifrs-full_ComprehensiveIncome_1"
          xlink:type="locator"/>
        <definitionArc
          order="249"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_ComprehensiveIncome_1"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl"
          xlink:label="ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl"
          xlink:type="locator"/>
        <definitionArc
          order="250"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_Equity"
          xlink:label="ifrs-full_Equity_2"
          xlink:type="locator"/>
        <definitionArc
          order="251"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_Equity_2"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NumberOfSharesOutstanding"
          xlink:label="ifrs-full_NumberOfSharesOutstanding"
          xlink:type="locator"/>
        <definitionArc
          order="252"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_NumberOfSharesOutstanding"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughIssueOfEquity"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughIssueOfEquity"
          xlink:type="locator"/>
        <definitionArc
          order="253"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughIssueOfEquity"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTreasuryShareTransactions"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTreasuryShareTransactions"
          xlink:type="locator"/>
        <definitionArc
          order="254"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTreasuryShareTransactions"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTransactionsWithOwners"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTransactionsWithOwners"
          xlink:type="locator"/>
        <definitionArc
          order="255"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTransactionsWithOwners"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NumberOfSharesOutstanding"
          xlink:label="ifrs-full_NumberOfSharesOutstanding_1"
          xlink:type="locator"/>
        <definitionArc
          order="256"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_NumberOfSharesOutstanding_1"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NumberOfSharesIssued"
          xlink:label="ifrs-full_NumberOfSharesIssued"
          xlink:type="locator"/>
        <definitionArc
          order="257"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_NumberOfSharesIssued"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesIssued"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesIssued"
          xlink:type="locator"/>
        <definitionArc
          order="258"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesIssued"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesIssuedThroughTransactionsWithOwners"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesIssuedThroughTransactionsWithOwners"
          xlink:type="locator"/>
        <definitionArc
          order="259"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesIssuedThroughTransactionsWithOwners"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_NumberOfSharesIssued"
          xlink:label="ifrs-full_NumberOfSharesIssued_1"
          xlink:type="locator"/>
        <definitionArc
          order="260"
          xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member"
          xlink:from="esef_cor_LineItemsNotDimensionallyQualifiedPlaceholder"
          xlink:to="ifrs-full_NumberOfSharesIssued_1"
          xlink:type="arc"/>
    </definitionLink>
    <definitionLink
      xlink:role="http://alten.com/xbrl/2022/role/Anchoring"
      xlink:type="extended">
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EquityAttributableToOwnersOfParent"
          xlink:label="ifrs-full_EquityAttributableToOwnersOfParent"
          xlink:type="locator"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_TreasurySharesOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriod"
          xlink:label="ALT_TreasurySharesOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriod"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_EquityAttributableToOwnersOfParent"
          xlink:to="ALT_TreasurySharesOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriod"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RetainedEarningsExcludingProfitLossForReportingPeriod"
          xlink:label="ifrs-full_RetainedEarningsExcludingProfitLossForReportingPeriod"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_TreasurySharesOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriod"
          xlink:to="ifrs-full_RetainedEarningsExcludingProfitLossForReportingPeriod"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_TreasuryShares"
          xlink:label="ifrs-full_TreasuryShares"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_TreasurySharesOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriod"
          xlink:to="ifrs-full_TreasuryShares"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AccumulatedOtherComprehensiveIncome"
          xlink:label="ifrs-full_AccumulatedOtherComprehensiveIncome"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_TreasurySharesOtherReservesAndRetainedEarningsExcludingProfitLossForReportingPeriod"
          xlink:to="ifrs-full_AccumulatedOtherComprehensiveIncome"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ExpenseByNature"
          xlink:label="ifrs-full_ExpenseByNature"
          xlink:type="locator"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_NonStockPurchasesAndSubcontractingBusiness"
          xlink:label="ALT_NonStockPurchasesAndSubcontractingBusiness"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_ExpenseByNature"
          xlink:to="ALT_NonStockPurchasesAndSubcontractingBusiness"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_EmployeeBenefitsExpense"
          xlink:label="ifrs-full_EmployeeBenefitsExpense"
          xlink:type="locator"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_EmployeeBenefitsExpenseExcludingExpenseFromShareBasedPaymentTransactionsWithEmployees"
          xlink:label="ALT_EmployeeBenefitsExpenseExcludingExpenseFromShareBasedPaymentTransactionsWithEmployees"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_EmployeeBenefitsExpense"
          xlink:to="ALT_EmployeeBenefitsExpenseExcludingExpenseFromShareBasedPaymentTransactionsWithEmployees"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_OtherOperatingExpensesFromOrdinaryActivities"
          xlink:label="ALT_OtherOperatingExpensesFromOrdinaryActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_ExpenseByNature"
          xlink:to="ALT_OtherOperatingExpensesFromOrdinaryActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_OtherIncome"
          xlink:label="ifrs-full_OtherIncome"
          xlink:type="locator"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_OtherOperatingIncomeFromOrdinaryActivities"
          xlink:label="ALT_OtherOperatingIncomeFromOrdinaryActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_OtherIncome"
          xlink:to="ALT_OtherOperatingIncomeFromOrdinaryActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_OtherOperatingExpensesFromNonOrdinaryActivities"
          xlink:label="ALT_OtherOperatingExpensesFromNonOrdinaryActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_ExpenseByNature"
          xlink:to="ALT_OtherOperatingExpensesFromNonOrdinaryActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_OtherOperatingIncomeFromNonOrdinaryActivities"
          xlink:label="ALT_OtherOperatingIncomeFromNonOrdinaryActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_OtherIncome"
          xlink:to="ALT_OtherOperatingIncomeFromNonOrdinaryActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_FinanceIncomeCost"
          xlink:label="ifrs-full_FinanceIncomeCost"
          xlink:type="locator"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_CostOfNetDebt"
          xlink:label="ALT_CostOfNetDebt"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_FinanceIncomeCost"
          xlink:to="ALT_CostOfNetDebt"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestIncomeOnCashAndCashEquivalents"
          xlink:label="ifrs-full_InterestIncomeOnCashAndCashEquivalents"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_CostOfNetDebt"
          xlink:to="ifrs-full_InterestIncomeOnCashAndCashEquivalents"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestExpense"
          xlink:label="ifrs-full_InterestExpense"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_CostOfNetDebt"
          xlink:to="ifrs-full_InterestExpense"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital"
          xlink:label="ifrs-full_AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital"
          xlink:type="locator"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_AdjustmentsForProvisionsAndAdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"
          xlink:label="ALT_AdjustmentsForProvisionsAndAdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_AdjustmentsToReconcileProfitLossOtherThanChangesInWorkingCapital"
          xlink:to="ALT_AdjustmentsForProvisionsAndAdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForProvisions"
          xlink:label="ifrs-full_AdjustmentsForProvisions"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_AdjustmentsForProvisionsAndAdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"
          xlink:to="ifrs-full_AdjustmentsForProvisions"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"
          xlink:label="ifrs-full_AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_AdjustmentsForProvisionsAndAdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"
          xlink:to="ifrs-full_AdjustmentsForDepreciationAndAmortisationExpenseAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForFinanceIncomeCost"
          xlink:label="ifrs-full_AdjustmentsForFinanceIncomeCost"
          xlink:type="locator"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_AdjustmentsForCostOfNetDebt"
          xlink:label="ALT_AdjustmentsForCostOfNetDebt"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_AdjustmentsForFinanceIncomeCost"
          xlink:to="ALT_AdjustmentsForCostOfNetDebt"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForInterestExpense"
          xlink:label="ifrs-full_AdjustmentsForInterestExpense"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_AdjustmentsForCostOfNetDebt"
          xlink:to="ifrs-full_AdjustmentsForInterestExpense"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForInterestIncome"
          xlink:label="ifrs-full_AdjustmentsForInterestIncome"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_AdjustmentsForCostOfNetDebt"
          xlink:to="ifrs-full_AdjustmentsForInterestIncome"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_AdjustmentsForFinancialProvisionsAndIncreaseArisingFromPassageOfTime"
          xlink:label="ALT_AdjustmentsForFinancialProvisionsAndIncreaseArisingFromPassageOfTime"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_AdjustmentsForFinanceIncomeCost"
          xlink:to="ALT_AdjustmentsForFinancialProvisionsAndIncreaseArisingFromPassageOfTime"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_AdjustmentsForIncreaseInOtherProvisionsArisingFromPassageOfTime"
          xlink:label="ifrs-full_AdjustmentsForIncreaseInOtherProvisionsArisingFromPassageOfTime"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_AdjustmentsForFinancialProvisionsAndIncreaseArisingFromPassageOfTime"
          xlink:to="ifrs-full_AdjustmentsForIncreaseInOtherProvisionsArisingFromPassageOfTime"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets"
          xlink:label="ifrs-full_PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets"
          xlink:type="locator"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_PurchaseOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:label="ALT_PurchaseOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_PurchaseOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets"
          xlink:to="ALT_PurchaseOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"
          xlink:label="ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_PurchaseOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:to="ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities"
          xlink:label="ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_PurchaseOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:to="ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities"
          xlink:label="ifrs-full_CashFlowsFromUsedInInvestingActivities"
          xlink:type="locator"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_CashAdvancesAndLoansMadeToOtherPartiesAndPurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:label="ALT_CashAdvancesAndLoansMadeToOtherPartiesAndPurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivities"
          xlink:to="ALT_CashAdvancesAndLoansMadeToOtherPartiesAndPurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashAdvancesAndLoansMadeToOtherPartiesClassifiedAsInvestingActivities"
          xlink:label="ifrs-full_CashAdvancesAndLoansMadeToOtherPartiesClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_CashAdvancesAndLoansMadeToOtherPartiesAndPurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:to="ifrs-full_CashAdvancesAndLoansMadeToOtherPartiesClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:label="ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_CashAdvancesAndLoansMadeToOtherPartiesAndPurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:to="ifrs-full_PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_ImpactOfChangesInScopeAndPaymentOfContingentConsiderationClassifiedAsInvestingActivities"
          xlink:label="ALT_ImpactOfChangesInScopeAndPaymentOfContingentConsiderationClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivities"
          xlink:to="ALT_ImpactOfChangesInScopeAndPaymentOfContingentConsiderationClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities"
          xlink:label="ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_ImpactOfChangesInScopeAndPaymentOfContingentConsiderationClassifiedAsInvestingActivities"
          xlink:to="ifrs-full_CashFlowsFromLosingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities"
          xlink:label="ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_ImpactOfChangesInScopeAndPaymentOfContingentConsiderationClassifiedAsInvestingActivities"
          xlink:to="ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromDisposalsOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets"
          xlink:label="ifrs-full_ProceedsFromDisposalsOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets"
          xlink:type="locator"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_ProceedsFromDisposalsOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:label="ALT_ProceedsFromDisposalsOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_ProceedsFromDisposalsOfPropertyPlantAndEquipmentIntangibleAssetsOtherThanGoodwillInvestmentPropertyAndOtherNoncurrentAssets"
          xlink:to="ALT_ProceedsFromDisposalsOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"
          xlink:label="ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_ProceedsFromDisposalsOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:to="ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities"
          xlink:label="ifrs-full_ProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_ProceedsFromDisposalsOfPropertyPlantAndEquipmentAndIntangibleAssetsOtherThanGoodwill"
          xlink:to="ifrs-full_ProceedsFromSalesOfIntangibleAssetsClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_CashReceiptsFromRepaymentOfAdvancesAndLoansMadeToOtherPartiesAndProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:label="ALT_CashReceiptsFromRepaymentOfAdvancesAndLoansMadeToOtherPartiesAndProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_CashFlowsFromUsedInInvestingActivities"
          xlink:to="ALT_CashReceiptsFromRepaymentOfAdvancesAndLoansMadeToOtherPartiesAndProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashReceiptsFromRepaymentOfAdvancesAndLoansMadeToOtherPartiesClassifiedAsInvestingActivities"
          xlink:label="ifrs-full_CashReceiptsFromRepaymentOfAdvancesAndLoansMadeToOtherPartiesClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_CashReceiptsFromRepaymentOfAdvancesAndLoansMadeToOtherPartiesAndProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:to="ifrs-full_CashReceiptsFromRepaymentOfAdvancesAndLoansMadeToOtherPartiesClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:label="ifrs-full_ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_CashReceiptsFromRepaymentOfAdvancesAndLoansMadeToOtherPartiesAndProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:to="ifrs-full_ProceedsFromSalesOrMaturityOfFinancialInstrumentsClassifiedAsInvestingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities"
          xlink:label="ifrs-full_CashFlowsFromUsedInFinancingActivities"
          xlink:type="locator"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_InterestPaidReceivedClassifiedAsFinancingActivities"
          xlink:label="ALT_InterestPaidReceivedClassifiedAsFinancingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivities"
          xlink:to="ALT_InterestPaidReceivedClassifiedAsFinancingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_InterestPaidClassifiedAsFinancingActivities"
          xlink:label="ifrs-full_InterestPaidClassifiedAsFinancingActivities"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_InterestPaidReceivedClassifiedAsFinancingActivities"
          xlink:to="ifrs-full_InterestPaidClassifiedAsFinancingActivities"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_PaymentsToAcquireOrRedeemEntitysSharesAndProceedsFromSaleOrIssueOfTreasuryShares"
          xlink:label="ALT_PaymentsToAcquireOrRedeemEntitysSharesAndProceedsFromSaleOrIssueOfTreasuryShares"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivities"
          xlink:to="ALT_PaymentsToAcquireOrRedeemEntitysSharesAndProceedsFromSaleOrIssueOfTreasuryShares"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_PaymentsToAcquireOrRedeemEntitysShares"
          xlink:label="ifrs-full_PaymentsToAcquireOrRedeemEntitysShares"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_PaymentsToAcquireOrRedeemEntitysSharesAndProceedsFromSaleOrIssueOfTreasuryShares"
          xlink:to="ifrs-full_PaymentsToAcquireOrRedeemEntitysShares"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromSaleOrIssueOfTreasuryShares"
          xlink:label="ifrs-full_ProceedsFromSaleOrIssueOfTreasuryShares"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_PaymentsToAcquireOrRedeemEntitysSharesAndProceedsFromSaleOrIssueOfTreasuryShares"
          xlink:to="ifrs-full_ProceedsFromSaleOrIssueOfTreasuryShares"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_ProceedsFromNonCurrentBorrowingsAndRepaymentsOfNonCurrentBorrowings"
          xlink:label="ALT_ProceedsFromNonCurrentBorrowingsAndRepaymentsOfNonCurrentBorrowings"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_CashFlowsFromUsedInFinancingActivities"
          xlink:to="ALT_ProceedsFromNonCurrentBorrowingsAndRepaymentsOfNonCurrentBorrowings"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_ProceedsFromNoncurrentBorrowings"
          xlink:label="ifrs-full_ProceedsFromNoncurrentBorrowings"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_ProceedsFromNonCurrentBorrowingsAndRepaymentsOfNonCurrentBorrowings"
          xlink:to="ifrs-full_ProceedsFromNoncurrentBorrowings"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_RepaymentsOfNoncurrentBorrowings"
          xlink:label="ifrs-full_RepaymentsOfNoncurrentBorrowings"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ALT_ProceedsFromNonCurrentBorrowingsAndRepaymentsOfNonCurrentBorrowings"
          xlink:to="ifrs-full_RepaymentsOfNoncurrentBorrowings"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding"
          xlink:label="ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding"
          xlink:type="locator"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughIssueOfEquity"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughIssueOfEquity"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughIssueOfEquity"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTreasuryShareTransactions"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTreasuryShareTransactions"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTreasuryShareTransactions"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTransactionsWithOwners"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTransactionsWithOwners"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_IncreaseDecreaseInNumberOfSharesOutstanding"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesOutstandingThroughTransactionsWithOwners"
          xlink:type="arc"/>
        <loc
          xlink:href="https://xbrl.ifrs.org/taxonomy/2022-03-24/full_ifrs/full_ifrs-cor_2022-03-24.xsd#ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued"
          xlink:label="ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued"
          xlink:type="locator"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesIssued"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesIssued"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesIssued"
          xlink:type="arc"/>
        <loc
          xlink:href="969500Y7G9TY7Y24GN07-2024-12-31.xsd#ALT_IncreaseDecreaseInNumberOfSharesIssuedThroughTransactionsWithOwners"
          xlink:label="ALT_IncreaseDecreaseInNumberOfSharesIssuedThroughTransactionsWithOwners"
          xlink:type="locator"/>
        <definitionArc
          order="1"
          xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower"
          xlink:from="ifrs-full_IncreaseDecreaseInNumberOfOrdinarySharesIssued"
          xlink:to="ALT_IncreaseDecreaseInNumberOfSharesIssuedThroughTransactionsWithOwners"
          xlink:type="arc"/>
    </definitionLink>
</linkbase>
