<?xml version="1.0" encoding="utf-8"?>
<!--Generated by DataTracks Rainbow version 3.0 for Toppan Merrill on 18-March-2022 [06:12:50] {AM}-->
<linkbase xmlns="http://www.xbrl.org/2003/linkbase" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:xbrldt="http://xbrl.org/2005/xbrldt">
<roleRef xlink:type="simple" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#ConsolidatedStatementOfChangesInEquity" roleURI="http://www.oci.nl/role/ConsolidatedStatementOfChangesInEquity" />
<roleRef xlink:type="simple" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#CoverPage" roleURI="http://www.oci.nl/role/CoverPage" />
<roleRef xlink:type="simple" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#ConsolidatedStatementOfCashFlows" roleURI="http://www.oci.nl/role/ConsolidatedStatementOfCashFlows" />
<roleRef xlink:type="simple" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#ConsolidatedStatementOfProfitOrLossAndOtherComprehensiveIncome" roleURI="http://www.oci.nl/role/ConsolidatedStatementOfProfitOrLossAndOtherComprehensiveIncome" />
<roleRef xlink:type="simple" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#ConsolidatedStatementOfFinancialPosition" roleURI="http://www.oci.nl/role/ConsolidatedStatementOfFinancialPosition" />
<roleRef xlink:type="simple" xlink:href="http://www.esma.europa.eu/taxonomy/2020-03-16/esef_cor.xsd#ifrs-dim_role-990000" roleURI="http://www.esma.europa.eu/xbrl/role/cor/ifrs-dim_role-990000" />
<roleRef xlink:type="simple" xlink:href="http://www.esma.europa.eu/taxonomy/2020-03-16/esef_cor.xsd#esef_role-999999" roleURI="http://www.esma.europa.eu/xbrl/role/cor/esef_role-999999" />
<roleRef xlink:type="simple" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#Anchoring" roleURI="http://www.oci.nl/role/Anchoring" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" />
<arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/notAll" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#notAll" />
<arcroleRef arcroleURI="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/arcrole/esma-arcrole-2018-11-21.xsd#wider-narrower" />
<definitionLink xlink:type="extended" xlink:role="http://www.oci.nl/role/ConsolidatedStatementOfChangesInEquity">
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfChangesInEquityLineItems" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems_100" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_StatementOfChangesInEquityTable" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable_95" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_100" xlink:to="loc_ifrs-full_StatementOfChangesInEquityTable_95" xbrldt:contextElement="scenario" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComponentsOfEquityAxis" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_96" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_95" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_96" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityMember" xlink:label="loc_ifrs-full_EquityMember_97" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_96" xlink:to="loc_ifrs-full_EquityMember_97" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IssuedCapitalMember" xlink:label="loc_ifrs-full_IssuedCapitalMember_101" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_97" xlink:to="loc_ifrs-full_IssuedCapitalMember_101" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RetainedEarningsMember" xlink:label="loc_ifrs-full_RetainedEarningsMember_104" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_97" xlink:to="loc_ifrs-full_RetainedEarningsMember_104" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_105" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_97" xlink:to="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_105" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncontrollingInterestsMember" xlink:label="loc_ifrs-full_NoncontrollingInterestsMember_106" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_97" xlink:to="loc_ifrs-full_NoncontrollingInterestsMember_106" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_SharePremiumMember" xlink:label="loc_ifrs-full_SharePremiumMember_102" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_97" xlink:to="loc_ifrs-full_SharePremiumMember_102" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherReservesMember" xlink:label="loc_ifrs-full_OtherReservesMember_103" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityMember_97" xlink:to="loc_ifrs-full_OtherReservesMember_103" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncome" xlink:label="loc_ifrs-full_OtherComprehensiveIncome_657923" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_100" xlink:to="loc_ifrs-full_OtherComprehensiveIncome_657923" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary_121" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_100" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary_121" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_ReversalOfDeclaredDividendsToNoncontrollingInterest" xlink:label="loc_oci_ReversalOfDeclaredDividendsToNoncontrollingInterest_657513" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_100" xlink:to="loc_oci_ReversalOfDeclaredDividendsToNoncontrollingInterest_657513" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_SaleOrIssueOfTreasuryShares" xlink:label="loc_ifrs-full_SaleOrIssueOfTreasuryShares_115" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_100" xlink:to="loc_ifrs-full_SaleOrIssueOfTreasuryShares_115" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PurchaseOfTreasuryShares" xlink:label="loc_ifrs-full_PurchaseOfTreasuryShares_116" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_100" xlink:to="loc_ifrs-full_PurchaseOfTreasuryShares_116" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity" xlink:label="loc_ifrs-full_Equity_657907" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_100" xlink:to="loc_ifrs-full_Equity_657907" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_122" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_100" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_122" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_113" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_100" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_113" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DividendsRecognisedAsDistributionsToNoncontrollingInterests" xlink:label="loc_ifrs-full_DividendsRecognisedAsDistributionsToNoncontrollingInterests_114" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_100" xlink:to="loc_ifrs-full_DividendsRecognisedAsDistributionsToNoncontrollingInterests_114" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary_715276" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_100" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary_715276" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss" xlink:label="loc_ifrs-full_ProfitLoss_110" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_100" xlink:to="loc_ifrs-full_ProfitLoss_110" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncome" xlink:label="loc_ifrs-full_ComprehensiveIncome_112" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_100" xlink:to="loc_ifrs-full_ComprehensiveIncome_112" use="optional" order="21" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.esma.europa.eu/xbrl/role/cor/ifrs-dim_role-990000" />
<definitionLink xlink:type="extended" xlink:role="http://www.esma.europa.eu/xbrl/role/cor/esef_role-999999">
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:label="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" />
<loc xlink:type="locator" xlink:href="http://www.esma.europa.eu/taxonomy/2020-03-16/esef_cor.xsd#esef_cor_LineItemsNotDimensionallyQualified" xlink:label="loc_LineItemsNotDimensionallyQualified" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_LineItemsNotDimensionallyQualified" xbrldt:contextElement="scenario" xbrldt:closed="true" use="optional" order="1" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForProvisions" xlink:label="loc_ifrs-full_AdjustmentsForProvisions_143" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_AdjustmentsForProvisions_143" use="optional" order="2" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_InterestPaidClassifiedAsOperatingActivities" xlink:label="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities_144" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_InterestPaidClassifiedAsOperatingActivities_144" use="optional" order="3" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInInvestingActivities" xlink:label="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_154" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_CashFlowsFromUsedInInvestingActivities_154" use="optional" order="4" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PaymentsToAcquireOrRedeemEntitysShares" xlink:label="loc_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares_156" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares_156" use="optional" order="5" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:label="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_157" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_157" use="optional" order="6" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PaymentsForDebtIssueCosts" xlink:label="loc_ifrs-full_PaymentsForDebtIssueCosts_159" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_PaymentsForDebtIssueCosts_159" use="optional" order="7" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities" xlink:label="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_160" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_160" use="optional" order="8" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition" xlink:label="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_717279" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_CashAndCashEquivalentsIfDifferentFromStatementOfFinancialPosition_717279" use="optional" order="9" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables_141" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAndOtherReceivables_141" use="optional" order="10" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForIncomeTaxExpense" xlink:label="loc_ifrs-full_AdjustmentsForIncomeTaxExpense_139" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_AdjustmentsForIncomeTaxExpense_139" use="optional" order="11" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_InterestReceivedClassifiedAsOperatingActivities" xlink:label="loc_ifrs-full_InterestReceivedClassifiedAsOperatingActivities_146" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_InterestReceivedClassifiedAsOperatingActivities_146" use="optional" order="12" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities" xlink:label="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_158" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_158" use="optional" order="13" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities" xlink:label="loc_ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_147" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_IncomeTaxesPaidRefundClassifiedAsOperatingActivities_147" use="optional" order="14" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:label="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_148" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_CashFlowsFromUsedInOperatingActivities_148" use="optional" order="15" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities" xlink:label="loc_ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities_657342" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_PurchaseOfIntangibleAssetsClassifiedAsInvestingActivities_657342" use="optional" order="16" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents" xlink:label="loc_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_168" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_EffectOfExchangeRateChangesOnCashAndCashEquivalents_168" use="optional" order="17" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:label="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_164" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_CashFlowsFromUsedInFinancingActivities_164" use="optional" order="18" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForSharebasedPayments" xlink:label="loc_ifrs-full_AdjustmentsForSharebasedPayments_137" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_AdjustmentsForSharebasedPayments_137" use="optional" order="19" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_ImpactDifferenceInProfitSharingNoncontrollingInterest" xlink:label="loc_oci_ImpactDifferenceInProfitSharingNoncontrollingInterest_138" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_oci_ImpactDifferenceInProfitSharingNoncontrollingInterest_138" use="optional" order="20" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProceedsFromChangesInOwnershipInterestsInSubsidiaries" xlink:label="loc_ifrs-full_ProceedsFromChangesInOwnershipInterestsInSubsidiaries_715294" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_ProceedsFromChangesInOwnershipInterestsInSubsidiaries_715294" use="optional" order="21" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_FeesRelatedToSaleOfSharesInFertiglobePlc" xlink:label="loc_oci_FeesRelatedToSaleOfSharesInFertiglobePlc_715295" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_oci_FeesRelatedToSaleOfSharesInFertiglobePlc_715295" use="optional" order="22" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinanceCostsPaidClassifiedAsOperatingActivities" xlink:label="loc_ifrs-full_FinanceCostsPaidClassifiedAsOperatingActivities_145" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_FinanceCostsPaidClassifiedAsOperatingActivities_145" use="optional" order="23" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForInterestIncome" xlink:label="loc_ifrs-full_AdjustmentsForInterestIncome_131" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_AdjustmentsForInterestIncome_131" use="optional" order="24" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges" xlink:label="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_166" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_IncreaseDecreaseInCashAndCashEquivalentsBeforeEffectOfExchangeRateChanges_166" use="optional" order="25" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_DepreciationAmortizationAndImpairment" xlink:label="loc_oci_DepreciationAmortizationAndImpairment_715282" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_oci_DepreciationAmortizationAndImpairment_715282" use="optional" order="26" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables" xlink:label="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables_142" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables_142" use="optional" order="27" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities" xlink:label="loc_ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities_161" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_DividendsPaidToNoncontrollingInterestsClassifiedAsFinancingActivities_161" use="optional" order="28" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PaymentsFromChangesInOwnershipInterestsInSubsidiaries" xlink:label="loc_ifrs-full_PaymentsFromChangesInOwnershipInterestsInSubsidiaries_715291" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_PaymentsFromChangesInOwnershipInterestsInSubsidiaries_715291" use="optional" order="29" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities" xlink:label="loc_ifrs-full_DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities_151" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_DividendsReceivedFromInvestmentsAccountedForUsingEquityMethodClassifiedAsInvestingActivities_151" use="optional" order="30" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_ProceedsFromSettlementOfFxDerivatives" xlink:label="loc_oci_ProceedsFromSettlementOfFxDerivatives_657483" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_oci_ProceedsFromSettlementOfFxDerivatives_657483" use="optional" order="31" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_BankOverdraftsClassifiedAsCashEquivalents" xlink:label="loc_ifrs-full_BankOverdraftsClassifiedAsCashEquivalents_717280" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_BankOverdraftsClassifiedAsCashEquivalents_717280" use="optional" order="32" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashAndCashEquivalents" xlink:label="loc_ifrs-full_CashAndCashEquivalents_717278" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_CashAndCashEquivalents_717278" use="optional" order="33" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities" xlink:label="loc_ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_715286" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_715286" use="optional" order="34" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_AdjustmentsForGainLossesForBusinessCombination" xlink:label="loc_oci_AdjustmentsForGainLossesForBusinessCombination_657482" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_oci_AdjustmentsForGainLossesForBusinessCombination_657482" use="optional" order="35" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInInventories" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories_140" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInInventories_140" use="optional" order="36" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_ProceedsFromNetDebtSettlementBusinessCombinationFertiglobe" xlink:label="loc_oci_ProceedsFromNetDebtSettlementBusinessCombinationFertiglobe_657484" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_oci_ProceedsFromNetDebtSettlementBusinessCombinationFertiglobe_657484" use="optional" order="37" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForInterestExpense" xlink:label="loc_ifrs-full_AdjustmentsForInterestExpense_132" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_AdjustmentsForInterestExpense_132" use="optional" order="38" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_NetForeignExchangeLossesGainsAndOthers" xlink:label="loc_oci_NetForeignExchangeLossesGainsAndOthers_133" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_oci_NetForeignExchangeLossesGainsAndOthers_133" use="optional" order="39" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod" xlink:label="loc_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod_135" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_AdjustmentsForUndistributedProfitsOfInvestmentsAccountedForUsingEquityMethod_135" use="optional" order="40" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary_121" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary_121" use="optional" order="41" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_ReversalOfDeclaredDividendsToNoncontrollingInterest" xlink:label="loc_oci_ReversalOfDeclaredDividendsToNoncontrollingInterest_657513" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_oci_ReversalOfDeclaredDividendsToNoncontrollingInterest_657513" use="optional" order="42" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_SaleOrIssueOfTreasuryShares" xlink:label="loc_ifrs-full_SaleOrIssueOfTreasuryShares_115" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_SaleOrIssueOfTreasuryShares_115" use="optional" order="43" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PurchaseOfTreasuryShares" xlink:label="loc_ifrs-full_PurchaseOfTreasuryShares_116" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_PurchaseOfTreasuryShares_116" use="optional" order="44" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Equity" xlink:label="loc_ifrs-full_Equity_657907" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_Equity_657907" use="optional" order="45" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_122" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_122" use="optional" order="46" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_113" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_113" use="optional" order="47" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DividendsRecognisedAsDistributionsToNoncontrollingInterests" xlink:label="loc_ifrs-full_DividendsRecognisedAsDistributionsToNoncontrollingInterests_114" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_DividendsRecognisedAsDistributionsToNoncontrollingInterests_114" use="optional" order="48" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary_715276" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughDisposalOfSubsidiary_715276" use="optional" order="49" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughOtherComprehensiveIncome" xlink:label="loc_ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughOtherComprehensiveIncome_26" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_NoncurrentFinancialAssetsAtFairValueThroughOtherComprehensiveIncome_26" use="optional" order="50" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentAssets" xlink:label="loc_ifrs-full_NoncurrentAssets_28" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_NoncurrentAssets_28" use="optional" order="51" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAttributableToOwnersOfParent" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParent_39" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_EquityAttributableToOwnersOfParent_39" use="optional" order="52" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PropertyPlantAndEquipment" xlink:label="loc_ifrs-full_PropertyPlantAndEquipment_21" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_PropertyPlantAndEquipment_21" use="optional" order="53" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RetainedEarnings" xlink:label="loc_ifrs-full_RetainedEarnings_38" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_RetainedEarnings_38" use="optional" order="54" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentLeaseLiabilities" xlink:label="loc_ifrs-full_NoncurrentLeaseLiabilities_43" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_NoncurrentLeaseLiabilities_43" use="optional" order="55" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncontrollingInterests" xlink:label="loc_ifrs-full_NoncontrollingInterests_40" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_NoncontrollingInterests_40" use="optional" order="56" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentTaxAssetsCurrent" xlink:label="loc_ifrs-full_CurrentTaxAssetsCurrent_31" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_CurrentTaxAssetsCurrent_31" use="optional" order="57" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentReceivables" xlink:label="loc_ifrs-full_NoncurrentReceivables_24" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_NoncurrentReceivables_24" use="optional" order="58" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_InvestmentAccountedForUsingEquityMethod" xlink:label="loc_ifrs-full_InvestmentAccountedForUsingEquityMethod_25" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_InvestmentAccountedForUsingEquityMethod_25" use="optional" order="59" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DeferredTaxAssets" xlink:label="loc_ifrs-full_DeferredTaxAssets_27" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_DeferredTaxAssets_27" use="optional" order="60" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_RightofuseAssets" xlink:label="loc_ifrs-full_RightofuseAssets_22" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_RightofuseAssets_22" use="optional" order="61" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IntangibleAssetsAndGoodwill" xlink:label="loc_ifrs-full_IntangibleAssetsAndGoodwill_23" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_IntangibleAssetsAndGoodwill_23" use="optional" order="62" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_SharePremium" xlink:label="loc_ifrs-full_SharePremium_36" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_SharePremium_36" use="optional" order="63" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentLiabilities" xlink:label="loc_ifrs-full_NoncurrentLiabilities_47" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_NoncurrentLiabilities_47" use="optional" order="64" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings" xlink:label="loc_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_48" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_48" use="optional" order="65" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentLeaseLiabilities" xlink:label="loc_ifrs-full_CurrentLeaseLiabilities_49" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_CurrentLeaseLiabilities_49" use="optional" order="66" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Assets" xlink:label="loc_ifrs-full_Assets_34" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_Assets_34" use="optional" order="67" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TradeAndOtherCurrentPayables" xlink:label="loc_ifrs-full_TradeAndOtherCurrentPayables_50" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_TradeAndOtherCurrentPayables_50" use="optional" order="68" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_TradeAndOtherCurrentReceivables" xlink:label="loc_ifrs-full_TradeAndOtherCurrentReceivables_30" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_TradeAndOtherCurrentReceivables_30" use="optional" order="69" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DeferredTaxLiabilities" xlink:label="loc_ifrs-full_DeferredTaxLiabilities_46" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_DeferredTaxLiabilities_46" use="optional" order="70" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Inventories" xlink:label="loc_ifrs-full_Inventories_29" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_Inventories_29" use="optional" order="71" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_LongtermBorrowings" xlink:label="loc_ifrs-full_LongtermBorrowings_42" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_LongtermBorrowings_42" use="optional" order="72" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentAssets" xlink:label="loc_ifrs-full_CurrentAssets_33" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_CurrentAssets_33" use="optional" order="73" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IssuedCapital" xlink:label="loc_ifrs-full_IssuedCapital_35" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_IssuedCapital_35" use="optional" order="74" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentPayables" xlink:label="loc_ifrs-full_NoncurrentPayables_44" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_NoncurrentPayables_44" use="optional" order="75" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NoncurrentProvisions" xlink:label="loc_ifrs-full_NoncurrentProvisions_45" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_NoncurrentProvisions_45" use="optional" order="76" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherReserves" xlink:label="loc_ifrs-full_OtherReserves_37" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_OtherReserves_37" use="optional" order="77" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentProvisions" xlink:label="loc_ifrs-full_CurrentProvisions_51" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_CurrentProvisions_51" use="optional" order="78" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentTaxLiabilities" xlink:label="loc_ifrs-full_CurrentTaxLiabilities_52" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_CurrentTaxLiabilities_52" use="optional" order="79" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CurrentLiabilities" xlink:label="loc_ifrs-full_CurrentLiabilities_53" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_CurrentLiabilities_53" use="optional" order="80" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Liabilities" xlink:label="loc_ifrs-full_Liabilities_54" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_Liabilities_54" use="optional" order="81" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_EquityAndLiabilities" xlink:label="loc_ifrs-full_EquityAndLiabilities_55" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_EquityAndLiabilities_55" use="optional" order="82" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherIncome" xlink:label="loc_ifrs-full_OtherIncome_68" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_OtherIncome_68" use="optional" order="83" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_GrossProfit" xlink:label="loc_ifrs-full_GrossProfit_67" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_GrossProfit_67" use="optional" order="84" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_Revenue" xlink:label="loc_ifrs-full_Revenue_65" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_Revenue_65" use="optional" order="85" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations" xlink:label="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_77" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_77" use="optional" order="86" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CostOfSales" xlink:label="loc_ifrs-full_CostOfSales_66" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_CostOfSales_66" use="optional" order="87" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAttributableToOwnersOfParent" xlink:label="loc_ifrs-full_ProfitLossAttributableToOwnersOfParent_85" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_ProfitLossAttributableToOwnersOfParent_85" use="optional" order="88" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossAttributableToNoncontrollingInterests" xlink:label="loc_ifrs-full_ProfitLossAttributableToNoncontrollingInterests_86" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_ProfitLossAttributableToNoncontrollingInterests_86" use="optional" order="89" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossBeforeTax" xlink:label="loc_ifrs-full_ProfitLossBeforeTax_76" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_ProfitLossBeforeTax_76" use="optional" order="90" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests" xlink:label="loc_ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests_89" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_ComprehensiveIncomeAttributableToNoncontrollingInterests_89" use="optional" order="91" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_OtherComprehensiveIncomeNetOfTaxCurrencyTranslationDifferencesFromEquityAccountedInvestees" xlink:label="loc_oci_OtherComprehensiveIncomeNetOfTaxCurrencyTranslationDifferencesFromEquityAccountedInvestees_81" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_oci_OtherComprehensiveIncomeNetOfTaxCurrencyTranslationDifferencesFromEquityAccountedInvestees_81" use="optional" order="92" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments_82" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments_82" use="optional" order="93" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges_79" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxCashFlowHedges_79" use="optional" order="94" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_SellingGeneralAndAdministrativeExpense" xlink:label="loc_ifrs-full_SellingGeneralAndAdministrativeExpense_69" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_SellingGeneralAndAdministrativeExpense_69" use="optional" order="95" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent" xlink:label="loc_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent_88" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_ComprehensiveIncomeAttributableToOwnersOfParent_88" use="optional" order="96" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DilutedEarningsLossPerShare" xlink:label="loc_ifrs-full_DilutedEarningsLossPerShare_92" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_DilutedEarningsLossPerShare_92" use="optional" order="97" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncome" xlink:label="loc_ifrs-full_OtherComprehensiveIncome_657922" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_OtherComprehensiveIncome_657922" use="optional" order="98" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinanceIncomeCost" xlink:label="loc_ifrs-full_FinanceIncomeCost_74" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_FinanceIncomeCost_74" use="optional" order="99" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation_80" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation_80" use="optional" order="100" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLossFromOperatingActivities" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities_71" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_ProfitLossFromOperatingActivities_71" use="optional" order="101" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinanceIncome" xlink:label="loc_ifrs-full_FinanceIncome_72" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_FinanceIncome_72" use="optional" order="102" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_FinanceCosts" xlink:label="loc_ifrs-full_FinanceCosts_73" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_FinanceCosts_73" use="optional" order="103" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_BasicEarningsLossPerShare" xlink:label="loc_ifrs-full_BasicEarningsLossPerShare_91" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_BasicEarningsLossPerShare_91" use="optional" order="104" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherExpenseByFunction" xlink:label="loc_ifrs-full_OtherExpenseByFunction_70" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_OtherExpenseByFunction_70" use="optional" order="105" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod" xlink:label="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_75" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_75" use="optional" order="106" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProfitLoss" xlink:label="loc_ifrs-full_ProfitLoss_657981" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_ProfitLoss_657981" use="optional" order="107" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_TotalComprehensiveIncomeAttributableToOwnersOfTheCompanyAndNonControllingInterests" xlink:label="loc_oci_TotalComprehensiveIncomeAttributableToOwnersOfTheCompanyAndNonControllingInterests_657982" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_oci_TotalComprehensiveIncomeAttributableToOwnersOfTheCompanyAndNonControllingInterests_657982" use="optional" order="108" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ComprehensiveIncome" xlink:label="loc_ifrs-full_ComprehensiveIncome_84" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_ComprehensiveIncome_84" use="optional" order="109" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DateOfEndOfReportingPeriod2013" xlink:label="loc_ifrs-full_DateOfEndOfReportingPeriod2013_9" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_DateOfEndOfReportingPeriod2013_9" use="optional" order="110" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DomicileOfEntity" xlink:label="loc_ifrs-full_DomicileOfEntity_10" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_DomicileOfEntity_10" use="optional" order="111" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification" xlink:label="loc_ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification_3" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_NameOfReportingEntityOrOtherMeansOfIdentification_3" use="optional" order="112" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_PrincipalPlaceOfBusiness" xlink:label="loc_ifrs-full_PrincipalPlaceOfBusiness_4" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_PrincipalPlaceOfBusiness_4" use="optional" order="113" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AddressOfRegisteredOfficeOfEntity" xlink:label="loc_ifrs-full_AddressOfRegisteredOfficeOfEntity_5" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_AddressOfRegisteredOfficeOfEntity_5" use="optional" order="114" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NameOfParentEntity" xlink:label="loc_ifrs-full_NameOfParentEntity_6" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_NameOfParentEntity_6" use="optional" order="115" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CountryOfIncorporation" xlink:label="loc_ifrs-full_CountryOfIncorporation_7" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_CountryOfIncorporation_7" use="optional" order="116" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities" xlink:label="loc_ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities_8" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_DescriptionOfNatureOfEntitysOperationsAndPrincipalActivities_8" use="optional" order="117" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_LegalFormOfEntity" xlink:label="loc_ifrs-full_LegalFormOfEntity_11" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_LegalFormOfEntity_11" use="optional" order="118" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_NameOfUltimateParentOfGroup" xlink:label="loc_ifrs-full_NameOfUltimateParentOfGroup_715880" />
<definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities_149" xlink:to="loc_ifrs-full_NameOfUltimateParentOfGroup_715880" use="optional" order="119" />
</definitionLink>
<definitionLink xlink:type="extended" xlink:role="http://www.oci.nl/role/Anchoring">
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInFinancingActivities" xlink:label="CashFlowsFromUsedInFinancingActivities" xlink:title="CashFlowsFromUsedInFinancingActivities" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_FeesRelatedToSaleOfSharesInFertiglobePlc" xlink:label="FeesRelatedToSaleOfSharesInFertiglobePlc" xlink:title="FeesRelatedToSaleOfSharesInFertiglobePlc" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInFinancingActivities" xlink:to="FeesRelatedToSaleOfSharesInFertiglobePlc" xlink:title="definition: CashFlowsFromUsedInFinancingActivities to FeesRelatedToSaleOfSharesInFertiglobePlc" order="1.0" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForReconcileProfitLoss" xlink:label="AdjustmentsForReconcileProfitLoss" xlink:title="AdjustmentsForReconcileProfitLoss" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_DepreciationAmortizationAndImpairment" xlink:label="DepreciationAmortizationAndImpairment" xlink:title="DepreciationAmortizationAndImpairment" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="AdjustmentsForReconcileProfitLoss" xlink:to="DepreciationAmortizationAndImpairment" xlink:title="definition: AdjustmentsForReconcileProfitLoss to DepreciationAmortizationAndImpairment" order="1.0" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:label="AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:title="AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_AdjustmentsForGainLossesForBusinessCombination" xlink:label="AdjustmentsForGainLossesForBusinessCombination" xlink:title="AdjustmentsForGainLossesForBusinessCombination" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates" xlink:to="AdjustmentsForGainLossesForBusinessCombination" xlink:title="definition: AdjustmentsForGainLossOnDisposalOfInvestmentsInSubsidiariesJointVenturesAndAssociates to AdjustmentsForGainLossesForBusinessCombination" order="1.0" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ChangesInEquity" xlink:label="ChangesInEquity" xlink:title="ChangesInEquity" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_ReversalOfDeclaredDividendsToNoncontrollingInterest" xlink:label="ReversalOfDeclaredDividendsToNoncontrollingInterest" xlink:title="ReversalOfDeclaredDividendsToNoncontrollingInterest" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ChangesInEquity" xlink:to="ReversalOfDeclaredDividendsToNoncontrollingInterest" xlink:title="definition: ChangesInEquity to ReversalOfDeclaredDividendsToNoncontrollingInterest" order="1.0" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:label="IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:title="IncreaseDecreaseThroughTransfersAndOtherChangesEquity" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ReversalOfDeclaredDividendsToNoncontrollingInterest" xlink:to="IncreaseDecreaseThroughTransfersAndOtherChangesEquity" xlink:title="definition: ReversalOfDeclaredDividendsToNoncontrollingInterest to IncreaseDecreaseThroughTransfersAndOtherChangesEquity" order="2.0" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:label="OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:title="OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_OtherComprehensiveIncomeNetOfTaxCurrencyTranslationDifferencesFromEquityAccountedInvestees" xlink:label="OtherComprehensiveIncomeNetOfTaxCurrencyTranslationDifferencesFromEquityAccountedInvestees" xlink:title="OtherComprehensiveIncomeNetOfTaxCurrencyTranslationDifferencesFromEquityAccountedInvestees" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax" xlink:to="OtherComprehensiveIncomeNetOfTaxCurrencyTranslationDifferencesFromEquityAccountedInvestees" xlink:title="definition: OtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTax to OtherComprehensiveIncomeNetOfTaxCurrencyTranslationDifferencesFromEquityAccountedInvestees" order="1.0" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation" xlink:label="OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation" xlink:title="OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="OtherComprehensiveIncomeNetOfTaxCurrencyTranslationDifferencesFromEquityAccountedInvestees" xlink:to="OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation" xlink:title="definition: OtherComprehensiveIncomeNetOfTaxCurrencyTranslationDifferencesFromEquityAccountedInvestees to OtherComprehensiveIncomeNetOfTaxExchangeDifferencesOnTranslation" order="2.0" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_CashFlowsFromUsedInOperatingActivities" xlink:label="CashFlowsFromUsedInOperatingActivities" xlink:title="CashFlowsFromUsedInOperatingActivities" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_ImpactDifferenceInProfitSharingNoncontrollingInterest" xlink:label="ImpactDifferenceInProfitSharingNoncontrollingInterest" xlink:title="ImpactDifferenceInProfitSharingNoncontrollingInterest" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInOperatingActivities" xlink:to="ImpactDifferenceInProfitSharingNoncontrollingInterest" xlink:title="definition: CashFlowsFromUsedInOperatingActivities to ImpactDifferenceInProfitSharingNoncontrollingInterest" order="1.0" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_NetForeignExchangeLossesGainsAndOthers" xlink:label="NetForeignExchangeLossesGainsAndOthers" xlink:title="NetForeignExchangeLossesGainsAndOthers" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="CashFlowsFromUsedInOperatingActivities" xlink:to="NetForeignExchangeLossesGainsAndOthers" xlink:title="definition: CashFlowsFromUsedInOperatingActivities to NetForeignExchangeLossesGainsAndOthers" order="1.0" />
<loc xlink:type="locator" xlink:href="http://xbrl.ifrs.org/taxonomy/2020-03-16/full_ifrs/full_ifrs-cor_2020-03-16.xsd#ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:label="ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:title="ProceedsFromBorrowingsClassifiedAsFinancingActivities" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_ProceedsFromSettlementOfFxDerivatives" xlink:label="ProceedsFromSettlementOfFxDerivatives" xlink:title="ProceedsFromSettlementOfFxDerivatives" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:to="ProceedsFromSettlementOfFxDerivatives" xlink:title="definition: ProceedsFromBorrowingsClassifiedAsFinancingActivities to ProceedsFromSettlementOfFxDerivatives" order="1.0" />
<loc xlink:type="locator" xlink:href="549300NCMRGIBJYUOE57-2021-12-31.xsd#oci_ProceedsFromNetDebtSettlementBusinessCombinationFertiglobe" xlink:label="ProceedsFromNetDebtSettlementBusinessCombinationFertiglobe" xlink:title="ProceedsFromNetDebtSettlementBusinessCombinationFertiglobe" />
<definitionArc xlink:type="arc" xlink:arcrole="http://www.esma.europa.eu/xbrl/esef/arcrole/wider-narrower" xlink:from="ProceedsFromBorrowingsClassifiedAsFinancingActivities" xlink:to="ProceedsFromNetDebtSettlementBusinessCombinationFertiglobe" xlink:title="definition: ProceedsFromBorrowingsClassifiedAsFinancingActivities to ProceedsFromNetDebtSettlementBusinessCombinationFertiglobe" order="1.0" />
</definitionLink>
</linkbase>