<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:01a03970-9a26-7a3e-a2de-92319b6e79c7,g:d7a69b16-2df2-41c5-b640-0756712ce4dd-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link: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"/>
  <link: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"/>
  <link: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"/>
  <link: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"/>
  <link:roleRef roleURI="http://www.cenovus.com/role/ConsolidatedStatementsofEquityunaudited" xlink:type="simple" xlink:href="cve-20260930.xsd#ConsolidatedStatementsofEquityunaudited"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/ConsolidatedStatementsofEquityunaudited" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfChangesInEquityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable_01a03970-9dad-764c-a254-72ea0fede9dd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfChangesInEquityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_ifrs-full_StatementOfChangesInEquityTable_01a03970-9dad-764c-a254-72ea0fede9dd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_01a03970-9dad-7ef7-b66b-be6c18d3429f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_01a03970-9dad-764c-a254-72ea0fede9dd" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_01a03970-9dad-7ef7-b66b-be6c18d3429f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9dad-7ef7-b66b-be6c18d3429f_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_01a03970-9dad-7ef7-b66b-be6c18d3429f" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9dad-7ef7-b66b-be6c18d3429f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9dad-7507-adea-22d782d5f42f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_01a03970-9dad-7ef7-b66b-be6c18d3429f" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9dad-7507-adea-22d782d5f42f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapitalMember_01a03970-9dad-765d-a7cb-91b8e090c13a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9dad-7507-adea-22d782d5f42f" xlink:to="loc_ifrs-full_IssuedCapitalMember_01a03970-9dad-765d-a7cb-91b8e090c13a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TreasurySharesMember_01a03970-9dad-7539-96dc-86d5989f35ba" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TreasurySharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9dad-7507-adea-22d782d5f42f" xlink:to="loc_ifrs-full_TreasurySharesMember_01a03970-9dad-7539-96dc-86d5989f35ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PreferenceSharesMember_01a03970-9dad-783b-a320-d677e65a8a83" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PreferenceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9dad-7507-adea-22d782d5f42f" xlink:to="loc_ifrs-full_PreferenceSharesMember_01a03970-9dad-783b-a320-d677e65a8a83" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WarrantsMember_01a03970-9dad-74ff-ac29-50c6b1cb5339" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9dad-7507-adea-22d782d5f42f" xlink:to="loc_ifrs-full_WarrantsMember_01a03970-9dad-74ff-ac29-50c6b1cb5339" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdditionalPaidinCapitalMember_01a03970-9dad-7179-bb76-65e726065924" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionalPaidinCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9dad-7507-adea-22d782d5f42f" xlink:to="loc_ifrs-full_AdditionalPaidinCapitalMember_01a03970-9dad-7179-bb76-65e726065924" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarningsMember_01a03970-9dad-73e8-925e-080bf3b71abd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9dad-7507-adea-22d782d5f42f" xlink:to="loc_ifrs-full_RetainedEarningsMember_01a03970-9dad-73e8-925e-080bf3b71abd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_01a03970-9dad-7df5-acd4-3a7e8940f308" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9dad-7507-adea-22d782d5f42f" xlink:to="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_01a03970-9dad-7df5-acd4-3a7e8940f308" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9dad-79e4-bd0d-2e6fe920c420" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_01a03970-9dad-764c-a254-72ea0fede9dd" xlink:to="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9dad-79e4-bd0d-2e6fe920c420" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9dad-79e4-bd0d-2e6fe920c420_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9dad-79e4-bd0d-2e6fe920c420" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9dad-79e4-bd0d-2e6fe920c420_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9dad-789d-95aa-80c023596e17" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9dad-79e4-bd0d-2e6fe920c420" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9dad-789d-95aa-80c023596e17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OrdinarySharesMember_01a03970-9dad-7f67-82ac-ea48909e9ad2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OrdinarySharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9dad-789d-95aa-80c023596e17" xlink:to="loc_ifrs-full_OrdinarySharesMember_01a03970-9dad-7f67-82ac-ea48909e9ad2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PreferenceSharesMember_01a03970-9dad-7d5e-9a4f-faf27bd211bf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PreferenceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9dad-789d-95aa-80c023596e17" xlink:to="loc_ifrs-full_PreferenceSharesMember_01a03970-9dad-7d5e-9a4f-faf27bd211bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_01a03970-9dad-7b28-8aea-7a547f2ec230" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_ifrs-full_Equity_01a03970-9dad-7b28-8aea-7a547f2ec230" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss_01a03970-9dad-71b2-a5e2-afa62768821c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_ifrs-full_ProfitLoss_01a03970-9dad-71b2-a5e2-afa62768821c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncome_01a03970-9dad-7898-aa47-c4b65ba83bdb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_ifrs-full_OtherComprehensiveIncome_01a03970-9dad-7898-aa47-c4b65ba83bdb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncome_01a03970-9dad-77b9-85a7-b7a8b15d109e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_ifrs-full_ComprehensiveIncome_01a03970-9dad-77b9-85a7-b7a8b15d109e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_01a03970-9dad-7989-ad26-e75d224f2df8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_01a03970-9dad-7989-ad26-e75d224f2df8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_01a03970-9dad-7fd7-8633-78c4c1eca3d4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughExerciseOfOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_01a03970-9dad-7fd7-8633-78c4c1eca3d4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RepurchaseOfEquity_01a03970-9dad-7031-a93b-024bfb68ffaa" xlink:href="cve-20260930.xsd#cve_RepurchaseOfEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_cve_RepurchaseOfEquity_01a03970-9dad-7031-a93b-024bfb68ffaa" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_PurchaseOfEquityCommonSharesUnderEmployeeBenefitPlan_01a03970-9dad-79ef-a0dc-e6cadc243d16" xlink:href="cve-20260930.xsd#cve_PurchaseOfEquityCommonSharesUnderEmployeeBenefitPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_cve_PurchaseOfEquityCommonSharesUnderEmployeeBenefitPlan_01a03970-9dad-79ef-a0dc-e6cadc243d16" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CommonSharesIssuedUnderEmployeeBenefitPlan_01a0575d-27a2-781b-bdef-203b2d9fdfe2" xlink:href="cve-20260930.xsd#cve_CommonSharesIssuedUnderEmployeeBenefitPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_cve_CommonSharesIssuedUnderEmployeeBenefitPlan_01a0575d-27a2-781b-bdef-203b2d9fdfe2" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssueOfEquity_01a03970-9dad-7139-a884-3da98d1988e0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssueOfEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_ifrs-full_IssueOfEquity_01a03970-9dad-7139-a884-3da98d1988e0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_PreferredSharesRedeemed_01a03970-9dad-7520-a5cf-3f2006971d97" xlink:href="cve-20260930.xsd#cve_PreferredSharesRedeemed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_cve_PreferredSharesRedeemed_01a03970-9dad-7520-a5cf-3f2006971d97" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity_01a03970-9dad-77f6-909f-7e522163e482" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfWarrantsEquity_01a03970-9dad-77f6-909f-7e522163e482" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_WarrantsPurchasedAndCancelledEquity_01a05767-6a31-742f-ad9a-1bf233463d08" xlink:href="cve-20260930.xsd#cve_WarrantsPurchasedAndCancelledEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_cve_WarrantsPurchasedAndCancelledEquity_01a05767-6a31-742f-ad9a-1bf233463d08" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_01a03970-9dad-7c2f-9d62-3e7878284185" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_01a03970-9dad-7c2f-9d62-3e7878284185" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaid_01a03970-9dad-7bfe-bd74-e0159c81a5d7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_01a03970-9dad-7494-8e3f-1918445e8fed" xlink:to="loc_ifrs-full_DividendsPaid_01a03970-9dad-7bfe-bd74-e0159c81a5d7" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_01a03970-9dad-78a1-b4fd-e7ade96a92e4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESAdditionalInformationDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-7d19-a3cd-5c60f88dbf32" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_01a03970-9dad-7cc6-a98a-c7f767dda493" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-7d19-a3cd-5c60f88dbf32" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_01a03970-9dad-7cc6-a98a-c7f767dda493" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsAxis_01a03970-9dad-77a5-b682-ccfec52c1bb1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_01a03970-9dad-7cc6-a98a-c7f767dda493" xlink:to="loc_ifrs-full_SegmentsAxis_01a03970-9dad-77a5-b682-ccfec52c1bb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_01a03970-9dad-77a5-b682-ccfec52c1bb1_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentsAxis_01a03970-9dad-77a5-b682-ccfec52c1bb1" xlink:to="loc_ifrs-full_SegmentsDomain_01a03970-9dad-77a5-b682-ccfec52c1bb1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_01a03970-9dad-72d0-809d-529d140d4968" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentsAxis_01a03970-9dad-77a5-b682-ccfec52c1bb1" xlink:to="loc_ifrs-full_SegmentsDomain_01a03970-9dad-72d0-809d-529d140d4968" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CanadianManufacturingMember_01a03970-9dad-7979-aa34-fcede258d29d" xlink:href="cve-20260930.xsd#cve_CanadianManufacturingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-72d0-809d-529d140d4968" xlink:to="loc_cve_CanadianManufacturingMember_01a03970-9dad-7979-aa34-fcede258d29d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_01a03970-9dad-72e6-8cad-2361dc7de41d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_01a03970-9dad-7cc6-a98a-c7f767dda493" xlink:to="loc_srt_ProductOrServiceAxis_01a03970-9dad-72e6-8cad-2361dc7de41d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a03970-9dad-72e6-8cad-2361dc7de41d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_01a03970-9dad-72e6-8cad-2361dc7de41d" xlink:to="loc_srt_ProductsAndServicesDomain_01a03970-9dad-72e6-8cad-2361dc7de41d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a03970-9dad-7d0a-ab80-9b9b81ce1eab" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_01a03970-9dad-72e6-8cad-2361dc7de41d" xlink:to="loc_srt_ProductsAndServicesDomain_01a03970-9dad-7d0a-ab80-9b9b81ce1eab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DownstreamMember_01a03970-9dad-7545-960e-9975c4e750d9" xlink:href="cve-20260930.xsd#cve_DownstreamMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a03970-9dad-7d0a-ab80-9b9b81ce1eab" xlink:to="loc_cve_DownstreamMember_01a03970-9dad-7545-960e-9975c4e750d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointVenturesAxis_01a0579f-b585-7f4e-8c4a-0e147a09827b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointVenturesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_01a03970-9dad-7cc6-a98a-c7f767dda493" xlink:to="loc_ifrs-full_JointVenturesAxis_01a0579f-b585-7f4e-8c4a-0e147a09827b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointVenturesDomain_01a0579f-b585-7f4e-8c4a-0e147a09827b_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_JointVenturesAxis_01a0579f-b585-7f4e-8c4a-0e147a09827b" xlink:to="loc_ifrs-full_JointVenturesDomain_01a0579f-b585-7f4e-8c4a-0e147a09827b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointVenturesDomain_01a0579f-b585-708c-8c4b-42cf63245a74" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_JointVenturesAxis_01a0579f-b585-7f4e-8c4a-0e147a09827b" xlink:to="loc_ifrs-full_JointVenturesDomain_01a0579f-b585-708c-8c4b-42cf63245a74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_WRBRefiningLPMember_01a0579f-b585-765b-9809-a06b8402205c" xlink:href="cve-20260930.xsd#cve_WRBRefiningLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_JointVenturesDomain_01a0579f-b585-708c-8c4b-42cf63245a74" xlink:to="loc_cve_WRBRefiningLPMember_01a0579f-b585-765b-9809-a06b8402205c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfEthanolPlants_01a03970-9dad-762d-8f9c-0ef3ca7fc79e" xlink:href="cve-20260930.xsd#cve_NumberOfEthanolPlants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-7d19-a3cd-5c60f88dbf32" xlink:to="loc_cve_NumberOfEthanolPlants_01a03970-9dad-762d-8f9c-0ef3ca7fc79e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_01a0579f-b585-7ae1-8948-b15bba2b326c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInJointVenture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-7d19-a3cd-5c60f88dbf32" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_01a0579f-b585-7ae1-8948-b15bba2b326c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofSegmentandOperationalInformationDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofSegmentandOperationalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofSegmentandOperationalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-74bb-ba9b-04fdf4935586" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_01a03970-9dad-7dce-8cc4-762248355407" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-74bb-ba9b-04fdf4935586" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_01a03970-9dad-7dce-8cc4-762248355407" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsAxis_01a03970-9dad-72d8-ab3d-3915366747d6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_01a03970-9dad-7dce-8cc4-762248355407" xlink:to="loc_ifrs-full_SegmentsAxis_01a03970-9dad-72d8-ab3d-3915366747d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_01a03970-9dad-72d8-ab3d-3915366747d6_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentsAxis_01a03970-9dad-72d8-ab3d-3915366747d6" xlink:to="loc_ifrs-full_SegmentsDomain_01a03970-9dad-72d8-ab3d-3915366747d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_01a03970-9dad-70e4-95fa-64c7f4125d1c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentsAxis_01a03970-9dad-72d8-ab3d-3915366747d6" xlink:to="loc_ifrs-full_SegmentsDomain_01a03970-9dad-70e4-95fa-64c7f4125d1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_OilSandsSegmentMember_01a03970-9dad-7070-9f57-d9be76f10d5f" xlink:href="cve-20260930.xsd#cve_OilSandsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-70e4-95fa-64c7f4125d1c" xlink:to="loc_cve_OilSandsSegmentMember_01a03970-9dad-7070-9f57-d9be76f10d5f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ConventionalSegmentMember_01a03970-9dad-7dda-8689-d19c60c13ad7" xlink:href="cve-20260930.xsd#cve_ConventionalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-70e4-95fa-64c7f4125d1c" xlink:to="loc_cve_ConventionalSegmentMember_01a03970-9dad-7dda-8689-d19c60c13ad7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_OffshoreMember_01a03970-9dad-7d00-944d-e2ca73518537" xlink:href="cve-20260930.xsd#cve_OffshoreMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-70e4-95fa-64c7f4125d1c" xlink:to="loc_cve_OffshoreMember_01a03970-9dad-7d00-944d-e2ca73518537" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CanadianRefiningMember_01a03970-9dad-7629-b99e-a77650543354" xlink:href="cve-20260930.xsd#cve_CanadianRefiningMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-70e4-95fa-64c7f4125d1c" xlink:to="loc_cve_CanadianRefiningMember_01a03970-9dad-7629-b99e-a77650543354" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_U.SRefiningMember_01a03970-9dad-72ed-b74f-e31fe55609f5" xlink:href="cve-20260930.xsd#cve_U.SRefiningMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-70e4-95fa-64c7f4125d1c" xlink:to="loc_cve_U.SRefiningMember_01a03970-9dad-72ed-b74f-e31fe55609f5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CorporateAndEliminationsSegmentMember_01a03970-9dad-795c-aae6-f793b35953a2" xlink:href="cve-20260930.xsd#cve_CorporateAndEliminationsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-70e4-95fa-64c7f4125d1c" xlink:to="loc_cve_CorporateAndEliminationsSegmentMember_01a03970-9dad-795c-aae6-f793b35953a2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_01a03970-9dad-7216-8f2f-54be543b0e75" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_01a03970-9dad-7dce-8cc4-762248355407" xlink:to="loc_srt_ProductOrServiceAxis_01a03970-9dad-7216-8f2f-54be543b0e75" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a03970-9dad-7216-8f2f-54be543b0e75_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_01a03970-9dad-7216-8f2f-54be543b0e75" xlink:to="loc_srt_ProductsAndServicesDomain_01a03970-9dad-7216-8f2f-54be543b0e75_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a03970-9dad-76dc-b1b6-3533d73a0285" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_01a03970-9dad-7216-8f2f-54be543b0e75" xlink:to="loc_srt_ProductsAndServicesDomain_01a03970-9dad-76dc-b1b6-3533d73a0285" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_UpstreamMember_01a03970-9dad-7215-9049-7f56eae78f58" xlink:href="cve-20260930.xsd#cve_UpstreamMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a03970-9dad-76dc-b1b6-3533d73a0285" xlink:to="loc_cve_UpstreamMember_01a03970-9dad-7215-9049-7f56eae78f58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DownstreamMember_01a03970-9dad-772b-815c-97aa144a040f" xlink:href="cve-20260930.xsd#cve_DownstreamMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a03970-9dad-76dc-b1b6-3533d73a0285" xlink:to="loc_cve_DownstreamMember_01a03970-9dad-772b-815c-97aa144a040f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9dad-7d91-8d56-8751f4124e6b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_01a03970-9dad-7dce-8cc4-762248355407" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9dad-7d91-8d56-8751f4124e6b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9dad-7d91-8d56-8751f4124e6b_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9dad-7d91-8d56-8751f4124e6b" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9dad-7d91-8d56-8751f4124e6b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9dad-7a78-83e1-f9e9f9131f48" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9dad-7d91-8d56-8751f4124e6b" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9dad-7a78-83e1-f9e9f9131f48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RealisedGainLossMember_01a03970-9dad-7830-9f1f-0447a33a8c88" xlink:href="cve-20260930.xsd#cve_RealisedGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9dad-7a78-83e1-f9e9f9131f48" xlink:to="loc_cve_RealisedGainLossMember_01a03970-9dad-7830-9f1f-0447a33a8c88" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_UnrealisedGainLossMember_01a03970-9dad-72e3-b2ac-fe844b972b02" xlink:href="cve-20260930.xsd#cve_UnrealisedGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9dad-7a78-83e1-f9e9f9131f48" xlink:to="loc_cve_UnrealisedGainLossMember_01a03970-9dad-72e3-b2ac-fe844b972b02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_01a03970-9dad-7f75-b44e-a648478a82db" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_01a03970-9dad-7dce-8cc4-762248355407" xlink:to="loc_srt_MajorCustomersAxis_01a03970-9dad-7f75-b44e-a648478a82db" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_01a03970-9dad-7f75-b44e-a648478a82db_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_01a03970-9dad-7f75-b44e-a648478a82db" xlink:to="loc_srt_NameOfMajorCustomerDomain_01a03970-9dad-7f75-b44e-a648478a82db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_01a03970-9dad-7e3b-b281-db188e86a42b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_01a03970-9dad-7f75-b44e-a648478a82db" xlink:to="loc_srt_NameOfMajorCustomerDomain_01a03970-9dad-7e3b-b281-db188e86a42b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ExternalSalesMember_01a03970-9dad-77eb-9da5-8a92134c8384" xlink:href="cve-20260930.xsd#cve_ExternalSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_01a03970-9dad-7e3b-b281-db188e86a42b" xlink:to="loc_cve_ExternalSalesMember_01a03970-9dad-77eb-9da5-8a92134c8384" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_IntersegmentSalesMember_01a03970-9dad-74ab-bd3d-0a7b074d0c99" xlink:href="cve-20260930.xsd#cve_IntersegmentSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_01a03970-9dad-7e3b-b281-db188e86a42b" xlink:to="loc_cve_IntersegmentSalesMember_01a03970-9dad-74ab-bd3d-0a7b074d0c99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueAbstract_01a03970-9dad-7f33-ad89-96c36c962947" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-74bb-ba9b-04fdf4935586" xlink:to="loc_ifrs-full_RevenueAbstract_01a03970-9dad-7f33-ad89-96c36c962947" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RevenueFromGrossSales_01a03970-9dad-70fe-b64f-d250d1f1135f" xlink:href="cve-20260930.xsd#cve_RevenueFromGrossSales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RevenueAbstract_01a03970-9dad-7f33-ad89-96c36c962947" xlink:to="loc_cve_RevenueFromGrossSales_01a03970-9dad-70fe-b64f-d250d1f1135f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RoyaltyExpense_01a03970-9dad-700a-b107-a7fb5a4578f8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RoyaltyExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RevenueAbstract_01a03970-9dad-7f33-ad89-96c36c962947" xlink:to="loc_ifrs-full_RoyaltyExpense_01a03970-9dad-700a-b107-a7fb5a4578f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue_01a03970-9dad-7f74-8031-2b7e909b6126" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Revenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RevenueAbstract_01a03970-9dad-7f33-ad89-96c36c962947" xlink:to="loc_ifrs-full_Revenue_01a03970-9dad-7f74-8031-2b7e909b6126" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaterialIncomeAndExpenseAbstract_01a03970-9dad-7e5c-820e-0801c5324602" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaterialIncomeAndExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-74bb-ba9b-04fdf4935586" xlink:to="loc_ifrs-full_MaterialIncomeAndExpenseAbstract_01a03970-9dad-7e5c-820e-0801c5324602" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RawMaterialsAndConsumablesUsed_01a03970-9dad-7739-b709-cc62e76c3460" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RawMaterialsAndConsumablesUsed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaterialIncomeAndExpenseAbstract_01a03970-9dad-7e5c-820e-0801c5324602" xlink:to="loc_ifrs-full_RawMaterialsAndConsumablesUsed_01a03970-9dad-7739-b709-cc62e76c3460" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TransportationAndBlendingExpense_01a03970-9dad-752d-9289-ddfd34cd0215" xlink:href="cve-20260930.xsd#cve_TransportationAndBlendingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaterialIncomeAndExpenseAbstract_01a03970-9dad-7e5c-820e-0801c5324602" xlink:to="loc_cve_TransportationAndBlendingExpense_01a03970-9dad-752d-9289-ddfd34cd0215" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_PurchasedProductTransportationAndBlending_01a03970-9dad-7272-b7ab-48e19e2a6895" xlink:href="cve-20260930.xsd#cve_PurchasedProductTransportationAndBlending"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaterialIncomeAndExpenseAbstract_01a03970-9dad-7e5c-820e-0801c5324602" xlink:to="loc_cve_PurchasedProductTransportationAndBlending_01a03970-9dad-7272-b7ab-48e19e2a6895" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OperatingExpense_01a03970-9dad-76b8-80dd-1bf7a07732fe" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OperatingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaterialIncomeAndExpenseAbstract_01a03970-9dad-7e5c-820e-0801c5324602" xlink:to="loc_ifrs-full_OperatingExpense_01a03970-9dad-76b8-80dd-1bf7a07732fe" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnChangeInFairValueOfDerivatives_01a03970-9dad-7fa2-9e1a-80dbd4245492" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesOnChangeInFairValueOfDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaterialIncomeAndExpenseAbstract_01a03970-9dad-7e5c-820e-0801c5324602" xlink:to="loc_ifrs-full_GainsLossesOnChangeInFairValueOfDerivatives_01a03970-9dad-7fa2-9e1a-80dbd4245492" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_OperatingMargin_01a03970-9dad-7125-998e-5b912732440c" xlink:href="cve-20260930.xsd#cve_OperatingMargin"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-74bb-ba9b-04fdf4935586" xlink:to="loc_cve_OperatingMargin_01a03970-9dad-7125-998e-5b912732440c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_01a03970-9dad-7bb3-acd2-41fa81f568cf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-74bb-ba9b-04fdf4935586" xlink:to="loc_ifrs-full_DepreciationAmortisationAndImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss_01a03970-9dad-7bb3-acd2-41fa81f568cf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpenseArisingFromExplorationForAndEvaluationOfMineralResources_01a03970-9dad-769a-8e6e-e2b8b2f6b901" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpenseArisingFromExplorationForAndEvaluationOfMineralResources"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-74bb-ba9b-04fdf4935586" xlink:to="loc_ifrs-full_ExpenseArisingFromExplorationForAndEvaluationOfMineralResources_01a03970-9dad-769a-8e6e-e2b8b2f6b901" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod_01a03970-9dad-70b6-8f86-6a6859605f4f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-74bb-ba9b-04fdf4935586" xlink:to="loc_ifrs-full_ShareOfProfitLossOfJointVenturesAccountedForUsingEquityMethod_01a03970-9dad-70b6-8f86-6a6859605f4f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ReportableSegmentProfitLoss_01a03970-9dad-76a5-abe8-e8f7cd5929b3" xlink:href="cve-20260930.xsd#cve_ReportableSegmentProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-74bb-ba9b-04fdf4935586" xlink:to="loc_cve_ReportableSegmentProfitLoss_01a03970-9dad-76a5-abe8-e8f7cd5929b3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeneralAndAdministrativeExpense_01a03970-9dad-74e8-84a8-e426c0b3fd1b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ReportableSegmentProfitLoss_01a03970-9dad-76a5-abe8-e8f7cd5929b3" xlink:to="loc_ifrs-full_GeneralAndAdministrativeExpense_01a03970-9dad-74e8-84a8-e426c0b3fd1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinanceCosts_01a03970-9dad-782b-bed9-d8fce44182c6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ReportableSegmentProfitLoss_01a03970-9dad-76a5-abe8-e8f7cd5929b3" xlink:to="loc_ifrs-full_FinanceCosts_01a03970-9dad-782b-bed9-d8fce44182c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_IntegrationCosts_01a03970-9dad-70e1-822c-28c84a644397" xlink:href="cve-20260930.xsd#cve_IntegrationCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ReportableSegmentProfitLoss_01a03970-9dad-76a5-abe8-e8f7cd5929b3" xlink:to="loc_cve_IntegrationCosts_01a03970-9dad-70e1-822c-28c84a644397" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_01a03970-9dad-7600-92e0-592e1c0e60d2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ReportableSegmentProfitLoss_01a03970-9dad-76a5-abe8-e8f7cd5929b3" xlink:to="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_01a03970-9dad-7600-92e0-592e1c0e60d2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RevaluationGainsLosses_01a03970-9dad-7c66-a37d-db88d814a8fe" xlink:href="cve-20260930.xsd#cve_RevaluationGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ReportableSegmentProfitLoss_01a03970-9dad-76a5-abe8-e8f7cd5929b3" xlink:to="loc_cve_RevaluationGainsLosses_01a03970-9dad-7c66-a37d-db88d814a8fe" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherGainsLosses_01a03970-9dad-7387-b1cf-cdfb2942464b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ReportableSegmentProfitLoss_01a03970-9dad-76a5-abe8-e8f7cd5929b3" xlink:to="loc_ifrs-full_OtherGainsLosses_01a03970-9dad-7387-b1cf-cdfb2942464b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CorporateAndEliminationsReportableSegmentCosts_01a03970-9dad-7015-baff-1093365e2c63" xlink:href="cve-20260930.xsd#cve_CorporateAndEliminationsReportableSegmentCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ReportableSegmentProfitLoss_01a03970-9dad-76a5-abe8-e8f7cd5929b3" xlink:to="loc_cve_CorporateAndEliminationsReportableSegmentCosts_01a03970-9dad-7015-baff-1093365e2c63" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax_01a03970-9dad-779d-b046-1b25a8fcc22d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-74bb-ba9b-04fdf4935586" xlink:to="loc_ifrs-full_ProfitLossBeforeTax_01a03970-9dad-779d-b046-1b25a8fcc22d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_01a03970-9dad-7902-878c-50f6acd12ae2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProfitLossBeforeTax_01a03970-9dad-779d-b046-1b25a8fcc22d" xlink:to="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_01a03970-9dad-7902-878c-50f6acd12ae2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss_01a03970-9dad-7830-8f36-6d582c13392f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_01a03970-9dad-74bb-ba9b-04fdf4935586" xlink:to="loc_ifrs-full_ProfitLoss_01a03970-9dad-7830-8f36-6d582c13392f" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofRevenuesbyProductDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofRevenuesbyProductDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofRevenuesbyProductDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-75e8-bd01-be0cf84003eb" xlink:href="cve-20260930.xsd#cve_DisclosureOfReportableSegmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfReportableSegmentsTable_01a03970-9dad-7fe2-93e0-5cf572fe8a65" xlink:href="cve-20260930.xsd#cve_DisclosureOfReportableSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-75e8-bd01-be0cf84003eb" xlink:to="loc_cve_DisclosureOfReportableSegmentsTable_01a03970-9dad-7fe2-93e0-5cf572fe8a65" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProductsAndServicesAxis_01a03970-9dad-7421-8d2a-27509bcbeb4c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfReportableSegmentsTable_01a03970-9dad-7fe2-93e0-5cf572fe8a65" xlink:to="loc_ifrs-full_ProductsAndServicesAxis_01a03970-9dad-7421-8d2a-27509bcbeb4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProductsAndServicesDomain_01a03970-9dad-7421-8d2a-27509bcbeb4c_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ProductsAndServicesAxis_01a03970-9dad-7421-8d2a-27509bcbeb4c" xlink:to="loc_ifrs-full_ProductsAndServicesDomain_01a03970-9dad-7421-8d2a-27509bcbeb4c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProductsAndServicesDomain_01a03970-9dad-7420-9020-cbce82f4c4ae" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ProductsAndServicesAxis_01a03970-9dad-7421-8d2a-27509bcbeb4c" xlink:to="loc_ifrs-full_ProductsAndServicesDomain_01a03970-9dad-7420-9020-cbce82f4c4ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_UpstreamMember_01a03970-9dad-7f95-9e01-aa8248431dc9" xlink:href="cve-20260930.xsd#cve_UpstreamMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProductsAndServicesDomain_01a03970-9dad-7420-9020-cbce82f4c4ae" xlink:to="loc_cve_UpstreamMember_01a03970-9dad-7f95-9e01-aa8248431dc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DownstreamMember_01a03970-9dad-78c4-a707-02f0590849e8" xlink:href="cve-20260930.xsd#cve_DownstreamMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ProductsAndServicesDomain_01a03970-9dad-7420-9020-cbce82f4c4ae" xlink:to="loc_cve_DownstreamMember_01a03970-9dad-78c4-a707-02f0590849e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsAxis_01a03970-9dad-763e-9ae5-9cc13ca17a59" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfReportableSegmentsTable_01a03970-9dad-7fe2-93e0-5cf572fe8a65" xlink:to="loc_ifrs-full_SegmentsAxis_01a03970-9dad-763e-9ae5-9cc13ca17a59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_01a03970-9dad-763e-9ae5-9cc13ca17a59_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentsAxis_01a03970-9dad-763e-9ae5-9cc13ca17a59" xlink:to="loc_ifrs-full_SegmentsDomain_01a03970-9dad-763e-9ae5-9cc13ca17a59_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7aa6-aaf9-63bd53c23a46" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentsAxis_01a03970-9dad-763e-9ae5-9cc13ca17a59" xlink:to="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7aa6-aaf9-63bd53c23a46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_OilSandsSegmentMember_01a03970-9dad-7c85-b513-6fa0b429aab4" xlink:href="cve-20260930.xsd#cve_OilSandsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7aa6-aaf9-63bd53c23a46" xlink:to="loc_cve_OilSandsSegmentMember_01a03970-9dad-7c85-b513-6fa0b429aab4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ConventionalSegmentMember_01a03970-9dad-7dfa-ab3d-af7852514649" xlink:href="cve-20260930.xsd#cve_ConventionalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7aa6-aaf9-63bd53c23a46" xlink:to="loc_cve_ConventionalSegmentMember_01a03970-9dad-7dfa-ab3d-af7852514649" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_OffshoreMember_01a03970-9dad-70cb-a4c2-a353663b4ac5" xlink:href="cve-20260930.xsd#cve_OffshoreMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7aa6-aaf9-63bd53c23a46" xlink:to="loc_cve_OffshoreMember_01a03970-9dad-70cb-a4c2-a353663b4ac5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CanadianManufacturingMember_01a03970-9dad-7309-8f7e-767d7e6ee10f" xlink:href="cve-20260930.xsd#cve_CanadianManufacturingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7aa6-aaf9-63bd53c23a46" xlink:to="loc_cve_CanadianManufacturingMember_01a03970-9dad-7309-8f7e-767d7e6ee10f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_USManufacturingMember_01a03970-9dad-760e-ab46-a9c68593e3ac" xlink:href="cve-20260930.xsd#cve_USManufacturingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7aa6-aaf9-63bd53c23a46" xlink:to="loc_cve_USManufacturingMember_01a03970-9dad-760e-ab46-a9c68593e3ac" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_UpstreamAbstract_01a03970-9dad-70de-a678-8d313eb6e9c2" xlink:href="cve-20260930.xsd#cve_UpstreamAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-75e8-bd01-be0cf84003eb" xlink:to="loc_cve_UpstreamAbstract_01a03970-9dad-70de-a678-8d313eb6e9c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueFromSaleOfCrudeOil_01a03970-9dad-79a7-a169-9fe813cb79e5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueFromSaleOfCrudeOil"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_UpstreamAbstract_01a03970-9dad-70de-a678-8d313eb6e9c2" xlink:to="loc_ifrs-full_RevenueFromSaleOfCrudeOil_01a03970-9dad-79a7-a169-9fe813cb79e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RevenueFromSaleOfNaturalGasAndOther_01a03970-9dad-7b27-80c2-24c9c22a3576" xlink:href="cve-20260930.xsd#cve_RevenueFromSaleOfNaturalGasAndOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_UpstreamAbstract_01a03970-9dad-70de-a678-8d313eb6e9c2" xlink:to="loc_cve_RevenueFromSaleOfNaturalGasAndOther_01a03970-9dad-7b27-80c2-24c9c22a3576" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RevenueFromSaleOfNaturalGasLiquids_01a03970-9dad-723d-8d0c-84b8b83b931e" xlink:href="cve-20260930.xsd#cve_RevenueFromSaleOfNaturalGasLiquids"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_UpstreamAbstract_01a03970-9dad-70de-a678-8d313eb6e9c2" xlink:to="loc_cve_RevenueFromSaleOfNaturalGasLiquids_01a03970-9dad-723d-8d0c-84b8b83b931e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DownstreamAbstract_01a03970-9dad-7011-b79c-2b6af3c3dbc9" xlink:href="cve-20260930.xsd#cve_DownstreamAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-75e8-bd01-be0cf84003eb" xlink:to="loc_cve_DownstreamAbstract_01a03970-9dad-7011-b79c-2b6af3c3dbc9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RevenueFromSaleOfGasoline_01a03970-9dad-7d34-bda3-0a223bec3eaa" xlink:href="cve-20260930.xsd#cve_RevenueFromSaleOfGasoline"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DownstreamAbstract_01a03970-9dad-7011-b79c-2b6af3c3dbc9" xlink:to="loc_cve_RevenueFromSaleOfGasoline_01a03970-9dad-7d34-bda3-0a223bec3eaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueFromSaleOfPetroleumAndPetrochemicalProducts_01a03970-9dad-73d7-9a6c-a95e3c15b76d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueFromSaleOfPetroleumAndPetrochemicalProducts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DownstreamAbstract_01a03970-9dad-7011-b79c-2b6af3c3dbc9" xlink:to="loc_ifrs-full_RevenueFromSaleOfPetroleumAndPetrochemicalProducts_01a03970-9dad-73d7-9a6c-a95e3c15b76d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueFromSaleOfCrudeOil_01a03970-9dad-708f-b39b-c7ec170fbd5d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueFromSaleOfCrudeOil"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RevenueFromSaleOfAsphalt_01a03970-9dad-7a18-9fc0-f5bbd55374ee" xlink:href="cve-20260930.xsd#cve_RevenueFromSaleOfAsphalt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DownstreamAbstract_01a03970-9dad-7011-b79c-2b6af3c3dbc9" xlink:to="loc_cve_RevenueFromSaleOfAsphalt_01a03970-9dad-7a18-9fc0-f5bbd55374ee" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RevenueFromSaleOfOtherProductsAndServices_01a03970-9dad-7b75-948f-adc575690a38" xlink:href="cve-20260930.xsd#cve_RevenueFromSaleOfOtherProductsAndServices"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DownstreamAbstract_01a03970-9dad-7011-b79c-2b6af3c3dbc9" xlink:to="loc_cve_RevenueFromSaleOfOtherProductsAndServices_01a03970-9dad-7b75-948f-adc575690a38" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RevenueFromGrossSales_01a03970-9dad-79ee-8ed2-cd01e479bc56" xlink:href="cve-20260930.xsd#cve_RevenueFromGrossSales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-75e8-bd01-be0cf84003eb" xlink:to="loc_cve_RevenueFromGrossSales_01a03970-9dad-79ee-8ed2-cd01e479bc56" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofGeographicalInformationDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofGeographicalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofGeographicalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfGeographicalAreasLineItems_01a03970-9dad-70da-9f62-3d353ed83705" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfGeographicalAreasLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfGeographicalAreasTable_01a03970-9dad-7742-a2f5-5b41f377f20c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfGeographicalAreasTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfGeographicalAreasLineItems_01a03970-9dad-70da-9f62-3d353ed83705" xlink:to="loc_ifrs-full_DisclosureOfGeographicalAreasTable_01a03970-9dad-7742-a2f5-5b41f377f20c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasAxis_01a03970-9dad-7dd5-8a66-a27b8add84e4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfGeographicalAreasTable_01a03970-9dad-7742-a2f5-5b41f377f20c" xlink:to="loc_ifrs-full_GeographicalAreasAxis_01a03970-9dad-7dd5-8a66-a27b8add84e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasDomain_01a03970-9dad-7dd5-8a66-a27b8add84e4_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_GeographicalAreasAxis_01a03970-9dad-7dd5-8a66-a27b8add84e4" xlink:to="loc_ifrs-full_GeographicalAreasDomain_01a03970-9dad-7dd5-8a66-a27b8add84e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasDomain_01a03970-9dad-742b-b5f4-0045c598672f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_GeographicalAreasAxis_01a03970-9dad-7dd5-8a66-a27b8add84e4" xlink:to="loc_ifrs-full_GeographicalAreasDomain_01a03970-9dad-742b-b5f4-0045c598672f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_01a03970-9dad-7b7a-9776-670b27abb95a" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_01a03970-9dad-742b-b5f4-0045c598672f" xlink:to="loc_country_CA_01a03970-9dad-7b7a-9776-670b27abb95a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_01a03970-9dad-7382-97b3-1024cd532d61" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_01a03970-9dad-742b-b5f4-0045c598672f" xlink:to="loc_country_US_01a03970-9dad-7382-97b3-1024cd532d61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_01a03970-9dad-77c9-91cb-a9ba6ea401da" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_01a03970-9dad-742b-b5f4-0045c598672f" xlink:to="loc_country_CN_01a03970-9dad-77c9-91cb-a9ba6ea401da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_ID_01a03970-9dad-7563-a64d-9c6b69f72de2" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_ID"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_01a03970-9dad-742b-b5f4-0045c598672f" xlink:to="loc_country_ID_01a03970-9dad-7563-a64d-9c6b69f72de2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue_01a03970-9dad-7bb5-938a-e4764542ce43" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Revenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfGeographicalAreasLineItems_01a03970-9dad-70da-9f62-3d353ed83705" xlink:to="loc_ifrs-full_Revenue_01a03970-9dad-7bb5-938a-e4764542ce43" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssetsOtherThanFinancialInstrumentsDeferredTaxAssetsPostemploymentBenefitAssetsAndRightsArisingUnderInsuranceContracts_01a03970-9dad-74d0-88fd-cf7f970eaa1d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentAssetsOtherThanFinancialInstrumentsDeferredTaxAssetsPostemploymentBenefitAssetsAndRightsArisingUnderInsuranceContracts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfGeographicalAreasLineItems_01a03970-9dad-70da-9f62-3d353ed83705" xlink:to="loc_ifrs-full_NoncurrentAssetsOtherThanFinancialInstrumentsDeferredTaxAssetsPostemploymentBenefitAssetsAndRightsArisingUnderInsuranceContracts_01a03970-9dad-74d0-88fd-cf7f970eaa1d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofAssetsbySegmentDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofAssetsbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofAssetsbySegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-7545-98f3-99794a63af16" xlink:href="cve-20260930.xsd#cve_DisclosureOfReportableSegmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfReportableSegmentsTable_01a03970-9dad-7933-b35d-c195bb26b994" xlink:href="cve-20260930.xsd#cve_DisclosureOfReportableSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-7545-98f3-99794a63af16" xlink:to="loc_cve_DisclosureOfReportableSegmentsTable_01a03970-9dad-7933-b35d-c195bb26b994" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsAxis_01a03970-9dad-7bb1-8284-89da8cddbbf7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfReportableSegmentsTable_01a03970-9dad-7933-b35d-c195bb26b994" xlink:to="loc_ifrs-full_SegmentsAxis_01a03970-9dad-7bb1-8284-89da8cddbbf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7bb1-8284-89da8cddbbf7_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentsAxis_01a03970-9dad-7bb1-8284-89da8cddbbf7" xlink:to="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7bb1-8284-89da8cddbbf7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7a9f-a87d-d3926115dfcd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentsAxis_01a03970-9dad-7bb1-8284-89da8cddbbf7" xlink:to="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7a9f-a87d-d3926115dfcd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_OilSandsSegmentMember_01a03970-9dad-7b94-8763-f0ed2841ce73" xlink:href="cve-20260930.xsd#cve_OilSandsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7a9f-a87d-d3926115dfcd" xlink:to="loc_cve_OilSandsSegmentMember_01a03970-9dad-7b94-8763-f0ed2841ce73" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ConventionalSegmentMember_01a03970-9dad-7568-82d9-7035df631274" xlink:href="cve-20260930.xsd#cve_ConventionalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7a9f-a87d-d3926115dfcd" xlink:to="loc_cve_ConventionalSegmentMember_01a03970-9dad-7568-82d9-7035df631274" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_OffshoreMember_01a03970-9dad-785c-bc1f-34f2d9e70a8c" xlink:href="cve-20260930.xsd#cve_OffshoreMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7a9f-a87d-d3926115dfcd" xlink:to="loc_cve_OffshoreMember_01a03970-9dad-785c-bc1f-34f2d9e70a8c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CanadianRefiningMember_01a03970-9dad-7e84-bd39-6ba61b386d50" xlink:href="cve-20260930.xsd#cve_CanadianRefiningMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7a9f-a87d-d3926115dfcd" xlink:to="loc_cve_CanadianRefiningMember_01a03970-9dad-7e84-bd39-6ba61b386d50" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_U.SRefiningMember_01a03970-9dad-7319-92c8-521df788fb8f" xlink:href="cve-20260930.xsd#cve_U.SRefiningMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7a9f-a87d-d3926115dfcd" xlink:to="loc_cve_U.SRefiningMember_01a03970-9dad-7319-92c8-521df788fb8f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CorporateAndEliminationsSegmentMember_01a03970-9dad-794a-b2e5-7238d3cac9ba" xlink:href="cve-20260930.xsd#cve_CorporateAndEliminationsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7a9f-a87d-d3926115dfcd" xlink:to="loc_cve_CorporateAndEliminationsSegmentMember_01a03970-9dad-794a-b2e5-7238d3cac9ba" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleExplorationAndEvaluationAssets_01a03970-9dad-7aab-9282-32b5d0d662e9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleExplorationAndEvaluationAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-7545-98f3-99794a63af16" xlink:to="loc_ifrs-full_IntangibleExplorationAndEvaluationAssets_01a03970-9dad-7aab-9282-32b5d0d662e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipment_01a03970-9dad-772e-9434-6f4e58ff6b66" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-7545-98f3-99794a63af16" xlink:to="loc_ifrs-full_PropertyPlantAndEquipment_01a03970-9dad-772e-9434-6f4e58ff6b66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RightofuseAssets_01a03970-9dad-7126-9e77-6cf84bf98259" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-7545-98f3-99794a63af16" xlink:to="loc_ifrs-full_RightofuseAssets_01a03970-9dad-7126-9e77-6cf84bf98259" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Goodwill_01a03970-9dad-7f52-84ad-716e8f0a4788" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-7545-98f3-99794a63af16" xlink:to="loc_ifrs-full_Goodwill_01a03970-9dad-7f52-84ad-716e8f0a4788" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets_01a03970-9dad-7417-a32b-7bea14df3a65" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-7545-98f3-99794a63af16" xlink:to="loc_ifrs-full_Assets_01a03970-9dad-7417-a32b-7bea14df3a65" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofCapitalExpendituresDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofCapitalExpendituresDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/DESCRIPTIONOFBUSINESSANDSEGMENTEDDISCLOSURESScheduleofCapitalExpendituresDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-785c-ad7d-e1f679da3246" xlink:href="cve-20260930.xsd#cve_DisclosureOfReportableSegmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfReportableSegmentsTable_01a03970-9dad-7801-beb0-0dd7069f31c6" xlink:href="cve-20260930.xsd#cve_DisclosureOfReportableSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-785c-ad7d-e1f679da3246" xlink:to="loc_cve_DisclosureOfReportableSegmentsTable_01a03970-9dad-7801-beb0-0dd7069f31c6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsAxis_01a03970-9dad-7419-bcd7-d23e2d1884bc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfReportableSegmentsTable_01a03970-9dad-7801-beb0-0dd7069f31c6" xlink:to="loc_ifrs-full_SegmentsAxis_01a03970-9dad-7419-bcd7-d23e2d1884bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7419-bcd7-d23e2d1884bc_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentsAxis_01a03970-9dad-7419-bcd7-d23e2d1884bc" xlink:to="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7419-bcd7-d23e2d1884bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7708-9a33-5c08b9845269" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentsAxis_01a03970-9dad-7419-bcd7-d23e2d1884bc" xlink:to="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7708-9a33-5c08b9845269" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_OilSandsSegmentMember_01a03970-9dad-73a0-b047-d487fc6879c5" xlink:href="cve-20260930.xsd#cve_OilSandsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7708-9a33-5c08b9845269" xlink:to="loc_cve_OilSandsSegmentMember_01a03970-9dad-73a0-b047-d487fc6879c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ConventionalSegmentMember_01a03970-9dad-7d31-92c0-2e244bf605ba" xlink:href="cve-20260930.xsd#cve_ConventionalSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7708-9a33-5c08b9845269" xlink:to="loc_cve_ConventionalSegmentMember_01a03970-9dad-7d31-92c0-2e244bf605ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_OffshoreMember_01a03970-9dad-7458-94e8-70cc5bbe72c1" xlink:href="cve-20260930.xsd#cve_OffshoreMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7708-9a33-5c08b9845269" xlink:to="loc_cve_OffshoreMember_01a03970-9dad-7458-94e8-70cc5bbe72c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CanadianRefiningMember_01a03970-9dad-7629-b42d-f9535ec8508b" xlink:href="cve-20260930.xsd#cve_CanadianRefiningMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7708-9a33-5c08b9845269" xlink:to="loc_cve_CanadianRefiningMember_01a03970-9dad-7629-b42d-f9535ec8508b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_U.SRefiningMember_01a03970-9dad-799b-a0bc-f37c8f52fa89" xlink:href="cve-20260930.xsd#cve_U.SRefiningMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7708-9a33-5c08b9845269" xlink:to="loc_cve_U.SRefiningMember_01a03970-9dad-799b-a0bc-f37c8f52fa89" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CorporateAndEliminationsSegmentMember_01a03970-9dad-7bf9-a0e6-afba6401a946" xlink:href="cve-20260930.xsd#cve_CorporateAndEliminationsSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a03970-9dad-7708-9a33-5c08b9845269" xlink:to="loc_cve_CorporateAndEliminationsSegmentMember_01a03970-9dad-7bf9-a0e6-afba6401a946" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_01a03970-9dad-7eb6-9cbe-5d56cdc9fc4e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfReportableSegmentsTable_01a03970-9dad-7801-beb0-0dd7069f31c6" xlink:to="loc_srt_StatementGeographicalAxis_01a03970-9dad-7eb6-9cbe-5d56cdc9fc4e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_01a03970-9dad-7eb6-9cbe-5d56cdc9fc4e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_01a03970-9dad-7eb6-9cbe-5d56cdc9fc4e" xlink:to="loc_srt_SegmentGeographicalDomain_01a03970-9dad-7eb6-9cbe-5d56cdc9fc4e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_01a03970-9dad-7406-9226-25e9d0ebbbab" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_01a03970-9dad-7eb6-9cbe-5d56cdc9fc4e" xlink:to="loc_srt_SegmentGeographicalDomain_01a03970-9dad-7406-9226-25e9d0ebbbab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AtlanticRegionMember_01a03970-9dad-7b2c-946d-88b719a66f37" xlink:href="cve-20260930.xsd#cve_AtlanticRegionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_01a03970-9dad-7406-9226-25e9d0ebbbab" xlink:to="loc_cve_AtlanticRegionMember_01a03970-9dad-7b2c-946d-88b719a66f37" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_01a03970-9dad-7025-a97c-aa58a23651a7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_01a03970-9dad-7406-9226-25e9d0ebbbab" xlink:to="loc_srt_AsiaPacificMember_01a03970-9dad-7025-a97c-aa58a23651a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_01a03970-9dad-7174-bc43-d211257a31ad" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfReportableSegmentsTable_01a03970-9dad-7801-beb0-0dd7069f31c6" xlink:to="loc_srt_ProductOrServiceAxis_01a03970-9dad-7174-bc43-d211257a31ad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a03970-9dad-7174-bc43-d211257a31ad_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_01a03970-9dad-7174-bc43-d211257a31ad" xlink:to="loc_srt_ProductsAndServicesDomain_01a03970-9dad-7174-bc43-d211257a31ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_01a03970-9dad-780e-9760-df3afb938428" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_01a03970-9dad-7174-bc43-d211257a31ad" xlink:to="loc_srt_ProductsAndServicesDomain_01a03970-9dad-780e-9760-df3afb938428" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_UpstreamMember_01a03970-9dad-7743-ad7a-040ecf4f0796" xlink:href="cve-20260930.xsd#cve_UpstreamMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a03970-9dad-780e-9760-df3afb938428" xlink:to="loc_cve_UpstreamMember_01a03970-9dad-7743-ad7a-040ecf4f0796" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DownstreamMember_01a03970-9dad-7df6-aaa2-5a87682aaa02" xlink:href="cve-20260930.xsd#cve_DownstreamMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_01a03970-9dad-780e-9760-df3afb938428" xlink:to="loc_cve_DownstreamMember_01a03970-9dad-7df6-aaa2-5a87682aaa02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipmentAndExplorationAndEvaluationAssets_01a03970-9dad-7082-89a7-3be5d15fbeeb" xlink:href="cve-20260930.xsd#cve_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipmentAndExplorationAndEvaluationAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-785c-ad7d-e1f679da3246" xlink:to="loc_cve_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipmentAndExplorationAndEvaluationAssets_01a03970-9dad-7082-89a7-3be5d15fbeeb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AcquisitionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipmentAndExplorationAndEvaluationAssets_01a03970-9dad-7a01-9881-2922e4fab3fe" xlink:href="cve-20260930.xsd#cve_AcquisitionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipmentAndExplorationAndEvaluationAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-785c-ad7d-e1f679da3246" xlink:to="loc_cve_AcquisitionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipmentAndExplorationAndEvaluationAssets_01a03970-9dad-7a01-9881-2922e4fab3fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_IncreaseDecreaseInPropertyPlantAndEquipmentAndExplorationAndEvaluationAssets_01a03970-9dad-7fd4-a090-1f68befe5001" xlink:href="cve-20260930.xsd#cve_IncreaseDecreaseInPropertyPlantAndEquipmentAndExplorationAndEvaluationAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfReportableSegmentsLineItems_01a03970-9dad-785c-ad7d-e1f679da3246" xlink:to="loc_cve_IncreaseDecreaseInPropertyPlantAndEquipmentAndExplorationAndEvaluationAssets_01a03970-9dad-7fd4-a090-1f68befe5001" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/MEGENERGYCORPACQUISITIONDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#MEGENERGYCORPACQUISITIONDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/MEGENERGYCORPACQUISITIONDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_01a057bc-eea2-738d-ab2b-e195218b7621" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_01a03970-9f7b-7ee2-afdb-2e10bc6386cb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_01a057bc-eea2-738d-ab2b-e195218b7621" xlink:to="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_01a03970-9f7b-7ee2-afdb-2e10bc6386cb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsAxis_01a057bc-eea2-7177-8d1c-09beea39d10e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_01a03970-9f7b-7ee2-afdb-2e10bc6386cb" xlink:to="loc_ifrs-full_BusinessCombinationsAxis_01a057bc-eea2-7177-8d1c-09beea39d10e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_01a057bc-eea2-7177-8d1c-09beea39d10e_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_01a057bc-eea2-7177-8d1c-09beea39d10e" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_01a057bc-eea2-7177-8d1c-09beea39d10e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_01a057bc-eea2-7792-902b-42d7f7ad03b7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_01a057bc-eea2-7177-8d1c-09beea39d10e" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_01a057bc-eea2-7792-902b-42d7f7ad03b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_MEGEnergyCorpMember_01a057bc-eea2-7973-8529-244bce2d5e6b" xlink:href="cve-20260930.xsd#cve_MEGEnergyCorpMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_01a057bc-eea2-7792-902b-42d7f7ad03b7" xlink:to="loc_cve_MEGEnergyCorpMember_01a057bc-eea2-7973-8529-244bce2d5e6b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_01a057bc-eea2-7025-8976-260da8009a1a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_01a057bc-eea2-738d-ab2b-e195218b7621" xlink:to="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_01a057bc-eea2-7025-8976-260da8009a1a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashTransferred_01a057bc-eea2-70f1-9824-53ca5026ea8a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_01a057bc-eea2-738d-ab2b-e195218b7621" xlink:to="loc_ifrs-full_CashTransferred_01a057bc-eea2-70f1-9824-53ca5026ea8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable_01a057bc-eea2-76c7-8a5f-60a7466ff0fb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_01a057bc-eea2-738d-ab2b-e195218b7621" xlink:to="loc_ifrs-full_NumberOfInstrumentsOrInterestsIssuedOrIssuable_01a057bc-eea2-76c7-8a5f-60a7466ff0fb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherTangibleOrIntangibleAssetsTransferred_01a057bc-eea2-79f4-8674-b61b7da1e221" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherTangibleOrIntangibleAssetsTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_01a057bc-eea2-738d-ab2b-e195218b7621" xlink:to="loc_ifrs-full_OtherTangibleOrIntangibleAssetsTransferred_01a057bc-eea2-79f4-8674-b61b7da1e221" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementPeriodAdjustmentsRecognisedForParticularAssetsLiabilitiesNoncontrollingInterestsOrItemsOfConsideration_01a1920d-e1bf-7761-b5fa-98f5b967cc47" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementPeriodAdjustmentsRecognisedForParticularAssetsLiabilitiesNoncontrollingInterestsOrItemsOfConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_01a057bc-eea2-738d-ab2b-e195218b7621" xlink:to="loc_ifrs-full_MeasurementPeriodAdjustmentsRecognisedForParticularAssetsLiabilitiesNoncontrollingInterestsOrItemsOfConsideration_01a1920d-e1bf-7761-b5fa-98f5b967cc47" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination_01a057bc-eea2-7ab1-a455-14686e302b06" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_01a057bc-eea2-738d-ab2b-e195218b7621" xlink:to="loc_ifrs-full_AcquisitionrelatedCostsForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination_01a057bc-eea2-7ab1-a455-14686e302b06" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/FOREIGNEXCHANGEGAINLOSSNETDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#FOREIGNEXCHANGEGAINLOSSNETDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/FOREIGNEXCHANGEGAINLOSSNETDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfEffectOfChangesInForeignExchangeRatesGainLossLineItems_01a03970-9dad-7952-aa9d-390a7618dc85" xlink:href="cve-20260930.xsd#cve_DisclosureOfEffectOfChangesInForeignExchangeRatesGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfEffectOfChangesInForeignExchangeRatesGainLossTable_01a03970-9dad-74fe-88dc-ad4715e3612b" xlink:href="cve-20260930.xsd#cve_DisclosureOfEffectOfChangesInForeignExchangeRatesGainLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cve_DisclosureOfEffectOfChangesInForeignExchangeRatesGainLossLineItems_01a03970-9dad-7952-aa9d-390a7618dc85" xlink:to="loc_cve_DisclosureOfEffectOfChangesInForeignExchangeRatesGainLossTable_01a03970-9dad-74fe-88dc-ad4715e3612b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesAxis_01a03970-9dad-7b04-8aa5-1e7753b12f9d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfEffectOfChangesInForeignExchangeRatesGainLossTable_01a03970-9dad-74fe-88dc-ad4715e3612b" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesAxis_01a03970-9dad-7b04-8aa5-1e7753b12f9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesDomain_01a03970-9dad-7b04-8aa5-1e7753b12f9d_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesAxis_01a03970-9dad-7b04-8aa5-1e7753b12f9d" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesDomain_01a03970-9dad-7b04-8aa5-1e7753b12f9d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesDomain_01a03970-9dad-7a9b-ac55-59e041a51dc0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesAxis_01a03970-9dad-7b04-8aa5-1e7753b12f9d" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesDomain_01a03970-9dad-7a9b-ac55-59e041a51dc0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermBorrowingsMember_01a03970-9dad-7567-a706-3c2c1dcd0a69" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_01a03970-9dad-7a9b-ac55-59e041a51dc0" xlink:to="loc_ifrs-full_LongtermBorrowingsMember_01a03970-9dad-7567-a706-3c2c1dcd0a69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_OthersMember_01a03970-9dad-77d4-9498-6d2f9ae34147" xlink:href="cve-20260930.xsd#cve_OthersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_01a03970-9dad-7a9b-ac55-59e041a51dc0" xlink:to="loc_cve_OthersMember_01a03970-9dad-77d4-9498-6d2f9ae34147" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_UnrealizedForeignExchangeGainLoss_01a03970-9dad-7da0-9400-ebdc5efc046f" xlink:href="cve-20260930.xsd#cve_UnrealizedForeignExchangeGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfEffectOfChangesInForeignExchangeRatesGainLossLineItems_01a03970-9dad-7952-aa9d-390a7618dc85" xlink:to="loc_cve_UnrealizedForeignExchangeGainLoss_01a03970-9dad-7da0-9400-ebdc5efc046f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RealizedForeignExchangeGainLoss_01a03970-9dad-7c56-ab1a-f62da3e7d36d" xlink:href="cve-20260930.xsd#cve_RealizedForeignExchangeGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfEffectOfChangesInForeignExchangeRatesGainLossLineItems_01a03970-9dad-7952-aa9d-390a7618dc85" xlink:to="loc_cve_RealizedForeignExchangeGainLoss_01a03970-9dad-7c56-ab1a-f62da3e7d36d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_01a03970-9dad-7c0e-8bb3-7c5baabb57cf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfEffectOfChangesInForeignExchangeRatesGainLossLineItems_01a03970-9dad-7952-aa9d-390a7618dc85" xlink:to="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss_01a03970-9dad-7c0e-8bb3-7c5baabb57cf" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/DIVESTITUREDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#DIVESTITUREDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/DIVESTITUREDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_01a057ee-a19c-7297-b991-ea5ed3b520d6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_01a03970-9e9d-75ae-9704-016de14469a4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_01a057ee-a19c-7297-b991-ea5ed3b520d6" xlink:to="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_01a03970-9e9d-75ae-9704-016de14469a4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointVenturesAxis_01a057ee-a19c-7207-8da0-91d652be1887" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointVenturesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_01a03970-9e9d-75ae-9704-016de14469a4" xlink:to="loc_ifrs-full_JointVenturesAxis_01a057ee-a19c-7207-8da0-91d652be1887" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointVenturesDomain_01a057ee-a19c-7207-8da0-91d652be1887_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_JointVenturesAxis_01a057ee-a19c-7207-8da0-91d652be1887" xlink:to="loc_ifrs-full_JointVenturesDomain_01a057ee-a19c-7207-8da0-91d652be1887_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointVenturesDomain_01a057ee-a19c-7d68-8aca-5b4a81fbb8f4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_JointVenturesAxis_01a057ee-a19c-7207-8da0-91d652be1887" xlink:to="loc_ifrs-full_JointVenturesDomain_01a057ee-a19c-7d68-8aca-5b4a81fbb8f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CanadianRefiningSegmentMember_01a07b0f-3e1d-7cba-a3c2-dac14e32d209" xlink:href="cve-20260930.xsd#cve_CanadianRefiningSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_JointVenturesDomain_01a057ee-a19c-7d68-8aca-5b4a81fbb8f4" xlink:to="loc_cve_CanadianRefiningSegmentMember_01a07b0f-3e1d-7cba-a3c2-dac14e32d209" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsAxis_01a057ee-a19c-7d61-b4c3-2065ba25ca9a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_01a03970-9e9d-75ae-9704-016de14469a4" xlink:to="loc_ifrs-full_SegmentsAxis_01a057ee-a19c-7d61-b4c3-2065ba25ca9a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_01a057ee-a19c-7d61-b4c3-2065ba25ca9a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentsAxis_01a057ee-a19c-7d61-b4c3-2065ba25ca9a" xlink:to="loc_ifrs-full_SegmentsDomain_01a057ee-a19c-7d61-b4c3-2065ba25ca9a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_01a057ee-a19c-7723-b270-8560ac1e3518" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentsAxis_01a057ee-a19c-7d61-b4c3-2065ba25ca9a" xlink:to="loc_ifrs-full_SegmentsDomain_01a057ee-a19c-7723-b270-8560ac1e3518" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CanadianRefiningSegmentMember_01a07b10-9df8-7389-8e82-5f844af653fa" xlink:href="cve-20260930.xsd#cve_CanadianRefiningSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_01a057ee-a19c-7723-b270-8560ac1e3518" xlink:to="loc_cve_CanadianRefiningSegmentMember_01a07b10-9df8-7389-8e82-5f844af653fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromDisposalOfOilAndGasAssets_01a057ee-a19c-79ae-a0f3-7d1e1f152080" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromDisposalOfOilAndGasAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_01a057ee-a19c-7297-b991-ea5ed3b520d6" xlink:to="loc_ifrs-full_ProceedsFromDisposalOfOilAndGasAssets_01a057ee-a19c-79ae-a0f3-7d1e1f152080" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnDisposalsOfNoncurrentAssets_01a057ee-a19c-77fc-8a60-9f8a8e8d9409" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesOnDisposalsOfNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_01a057ee-a19c-7297-b991-ea5ed3b520d6" xlink:to="loc_ifrs-full_GainsLossesOnDisposalsOfNoncurrentAssets_01a057ee-a19c-77fc-8a60-9f8a8e8d9409" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/INCOMETAXESProvisionforIncomeTaxesDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#INCOMETAXESProvisionforIncomeTaxesDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/INCOMETAXESProvisionforIncomeTaxesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cve_MajorComponentsOfTaxExpenseIncomeLineItems_01a03970-9e9d-7102-b649-8e9373712c06" xlink:href="cve-20260930.xsd#cve_MajorComponentsOfTaxExpenseIncomeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfComponentsOfTaxExpenseIncomeTable_01a03970-9e9d-73d8-ab3a-e38dd69324ae" xlink:href="cve-20260930.xsd#cve_DisclosureOfComponentsOfTaxExpenseIncomeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cve_MajorComponentsOfTaxExpenseIncomeLineItems_01a03970-9e9d-7102-b649-8e9373712c06" xlink:to="loc_cve_DisclosureOfComponentsOfTaxExpenseIncomeTable_01a03970-9e9d-73d8-ab3a-e38dd69324ae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasAxis_01a03970-9e9d-73fb-a3dd-c4d5ac0e2eb3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfComponentsOfTaxExpenseIncomeTable_01a03970-9e9d-73d8-ab3a-e38dd69324ae" xlink:to="loc_ifrs-full_GeographicalAreasAxis_01a03970-9e9d-73fb-a3dd-c4d5ac0e2eb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasDomain_01a03970-9e9d-73fb-a3dd-c4d5ac0e2eb3_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_GeographicalAreasAxis_01a03970-9e9d-73fb-a3dd-c4d5ac0e2eb3" xlink:to="loc_ifrs-full_GeographicalAreasDomain_01a03970-9e9d-73fb-a3dd-c4d5ac0e2eb3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasDomain_01a03970-9e9d-74d2-a966-3e3a16a13487" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_GeographicalAreasAxis_01a03970-9e9d-73fb-a3dd-c4d5ac0e2eb3" xlink:to="loc_ifrs-full_GeographicalAreasDomain_01a03970-9e9d-74d2-a966-3e3a16a13487" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_01a03970-9e9d-7bf0-acb6-a25f2c1b597a" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_01a03970-9e9d-74d2-a966-3e3a16a13487" xlink:to="loc_country_CA_01a03970-9e9d-7bf0-acb6-a25f2c1b597a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_01a03970-9e9d-7577-860e-f1e0e00920ed" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_01a03970-9e9d-74d2-a966-3e3a16a13487" xlink:to="loc_country_US_01a03970-9e9d-7577-860e-f1e0e00920ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_01a03970-9e9d-78f2-ab26-ebd99643f729" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AsiaPacificMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_01a03970-9e9d-74d2-a966-3e3a16a13487" xlink:to="loc_srt_AsiaPacificMember_01a03970-9e9d-78f2-ab26-ebd99643f729" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_OtherInternationalMember_01a03970-9e9d-7647-8bbe-9d57a2a6a5cb" xlink:href="cve-20260930.xsd#cve_OtherInternationalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_01a03970-9e9d-74d2-a966-3e3a16a13487" xlink:to="loc_cve_OtherInternationalMember_01a03970-9e9d-7647-8bbe-9d57a2a6a5cb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentTaxExpenseIncome_01a03970-9e9d-7a70-8d0d-96afeeb07c2d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentTaxExpenseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_MajorComponentsOfTaxExpenseIncomeLineItems_01a03970-9e9d-7102-b649-8e9373712c06" xlink:to="loc_ifrs-full_CurrentTaxExpenseIncome_01a03970-9e9d-7a70-8d0d-96afeeb07c2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxExpenseIncome_01a03970-9e9d-79ed-afda-20ebf9fc07e1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DeferredTaxExpenseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_MajorComponentsOfTaxExpenseIncomeLineItems_01a03970-9e9d-7102-b649-8e9373712c06" xlink:to="loc_ifrs-full_DeferredTaxExpenseIncome_01a03970-9e9d-79ed-afda-20ebf9fc07e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_01a03970-9e9d-7d1b-8c5c-7173c0a98b40" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncomeTaxExpenseContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_MajorComponentsOfTaxExpenseIncomeLineItems_01a03970-9e9d-7102-b649-8e9373712c06" xlink:to="loc_ifrs-full_IncomeTaxExpenseContinuingOperations_01a03970-9e9d-7d1b-8c5c-7173c0a98b40" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/PERSHAREAMOUNTSAdditionalInformationDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#PERSHAREAMOUNTSAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/PERSHAREAMOUNTSAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a057f5-2747-7c92-9f57-a3e087b79618" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_01a03970-9e9d-7797-a1a6-94741649fee8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a057f5-2747-7c92-9f57-a3e087b79618" xlink:to="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_01a03970-9e9d-7797-a1a6-94741649fee8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis_01a057f5-2747-709d-8e6d-c151a4ee2013" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_01a03970-9e9d-7797-a1a6-94741649fee8" xlink:to="loc_ifrs-full_ClassesOfShareCapitalAxis_01a057f5-2747-709d-8e6d-c151a4ee2013" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_01a057f5-2747-709d-8e6d-c151a4ee2013_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_01a057f5-2747-709d-8e6d-c151a4ee2013" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_01a057f5-2747-709d-8e6d-c151a4ee2013_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_01a057f5-2747-77e8-b4e6-0cf2cb5e4802" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_01a057f5-2747-709d-8e6d-c151a4ee2013" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_01a057f5-2747-77e8-b4e6-0cf2cb5e4802" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OrdinarySharesMember_01a057f5-2747-7b5d-8098-7a931c769a99" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OrdinarySharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_01a057f5-2747-77e8-b4e6-0cf2cb5e4802" xlink:to="loc_ifrs-full_OrdinarySharesMember_01a057f5-2747-7b5d-8098-7a931c769a99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PreferenceSharesMember_01a057f5-5dc9-746a-a819-c8a7e270c247" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PreferenceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_01a057f5-2747-77e8-b4e6-0cf2cb5e4802" xlink:to="loc_ifrs-full_PreferenceSharesMember_01a057f5-5dc9-746a-a819-c8a7e270c247" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a057f5-44d5-76f3-943f-882c4a8c5e76" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_01a03970-9e9d-7797-a1a6-94741649fee8" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a057f5-44d5-76f3-943f-882c4a8c5e76" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a057f5-44d5-76f3-943f-882c4a8c5e76_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a057f5-44d5-76f3-943f-882c4a8c5e76" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a057f5-44d5-76f3-943f-882c4a8c5e76_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a057f5-44d5-776f-a60d-7b792b1859cc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a057f5-44d5-76f3-943f-882c4a8c5e76" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a057f5-44d5-776f-a60d-7b792b1859cc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PotentialOrdinaryShareTransactionsMember_01a057f5-44d5-793b-955c-496e2584ea6c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PotentialOrdinaryShareTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a057f5-44d5-776f-a60d-7b792b1859cc" xlink:to="loc_ifrs-full_PotentialOrdinaryShareTransactionsMember_01a057f5-44d5-793b-955c-496e2584ea6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_InstrumentsWithPotentialFutureDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShareShares_01a057f5-2747-7224-9697-9c4bd16b0e0e" xlink:href="cve-20260930.xsd#cve_InstrumentsWithPotentialFutureDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShareShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a057f5-2747-7c92-9f57-a3e087b79618" xlink:to="loc_cve_InstrumentsWithPotentialFutureDilutiveEffectNotIncludedInCalculationOfDilutedEarningsPerShareShares_01a057f5-2747-7224-9697-9c4bd16b0e0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaid_01a057f5-44d5-7712-9f43-fafc40bfdccd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a057f5-2747-7c92-9f57-a3e087b79618" xlink:to="loc_ifrs-full_DividendsPaid_01a057f5-44d5-7712-9f43-fafc40bfdccd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaidOrdinarySharesPerShare_01a057f5-44d5-7664-b230-a3c0cc02cc0d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsPaidOrdinarySharesPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a057f5-2747-7c92-9f57-a3e087b79618" xlink:to="loc_ifrs-full_DividendsPaidOrdinarySharesPerShare_01a057f5-44d5-7664-b230-a3c0cc02cc0d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare_01a057f5-44d5-7b80-b2c2-7c8f155c8b47" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a057f5-2747-7c92-9f57-a3e087b79618" xlink:to="loc_ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare_01a057f5-44d5-7b80-b2c2-7c8f155c8b47" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaidOtherShares_01a057f5-5dc9-7dd6-86af-cad0d37285b9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsPaidOtherShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a057f5-2747-7c92-9f57-a3e087b79618" xlink:to="loc_ifrs-full_DividendsPaidOtherShares_01a057f5-5dc9-7dd6-86af-cad0d37285b9" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/EXPLORATIONANDEVALUATIONASSETSNETDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#EXPLORATIONANDEVALUATIONASSETSNETDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/EXPLORATIONANDEVALUATIONASSETSNETDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfExplorationAndEvaluationAssetsLineItems_01a03970-9e9d-7c4d-ad4c-52cc82345c41" xlink:href="cve-20260930.xsd#cve_DisclosureOfExplorationAndEvaluationAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfExplorationAndEvaluationAssetsTable_01a03970-9e9d-7924-b810-c6e1da614a60" xlink:href="cve-20260930.xsd#cve_DisclosureOfExplorationAndEvaluationAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cve_DisclosureOfExplorationAndEvaluationAssetsLineItems_01a03970-9e9d-7c4d-ad4c-52cc82345c41" xlink:to="loc_cve_DisclosureOfExplorationAndEvaluationAssetsTable_01a03970-9e9d-7924-b810-c6e1da614a60" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsAxis_01a03970-9e9d-75f9-aa29-b0cc4ce49be6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfExplorationAndEvaluationAssetsTable_01a03970-9e9d-7924-b810-c6e1da614a60" xlink:to="loc_ifrs-full_ClassesOfAssetsAxis_01a03970-9e9d-75f9-aa29-b0cc4ce49be6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsDomain_01a03970-9e9d-75f9-aa29-b0cc4ce49be6_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis_01a03970-9e9d-75f9-aa29-b0cc4ce49be6" xlink:to="loc_ifrs-full_ClassesOfAssetsDomain_01a03970-9e9d-75f9-aa29-b0cc4ce49be6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsDomain_01a03970-9e9d-7e74-a464-2c6d3a9e8704" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis_01a03970-9e9d-75f9-aa29-b0cc4ce49be6" xlink:to="loc_ifrs-full_ClassesOfAssetsDomain_01a03970-9e9d-7e74-a464-2c6d3a9e8704" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExplorationAndEvaluationAssetsMember_01a03970-9e9d-7d95-bc86-fa6cdb924215" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExplorationAndEvaluationAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_01a03970-9e9d-7e74-a464-2c6d3a9e8704" xlink:to="loc_ifrs-full_ExplorationAndEvaluationAssetsMember_01a03970-9e9d-7d95-bc86-fa6cdb924215" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleExplorationAndEvaluationAssets_01a03970-9e9d-7128-ab29-ae008760a39a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleExplorationAndEvaluationAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfExplorationAndEvaluationAssetsLineItems_01a03970-9e9d-7c4d-ad4c-52cc82345c41" xlink:to="loc_ifrs-full_IntangibleExplorationAndEvaluationAssets_01a03970-9e9d-7128-ab29-ae008760a39a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment_01a057fa-b880-7217-92aa-c10cb5ede303" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfExplorationAndEvaluationAssetsLineItems_01a03970-9e9d-7c4d-ad4c-52cc82345c41" xlink:to="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment_01a057fa-b880-7217-92aa-c10cb5ede303" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AdditionsOfExplorationAndEvaluationAssets_01a03970-9e9d-77f4-af17-a572e8efd28a" xlink:href="cve-20260930.xsd#cve_AdditionsOfExplorationAndEvaluationAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfExplorationAndEvaluationAssetsLineItems_01a03970-9e9d-7c4d-ad4c-52cc82345c41" xlink:to="loc_cve_AdditionsOfExplorationAndEvaluationAssets_01a03970-9e9d-77f4-af17-a572e8efd28a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ChangesInPropertyPlantAndEquipment_01a13f14-65d2-74c7-b114-8c1e79bd895c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ChangesInPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfExplorationAndEvaluationAssetsLineItems_01a03970-9e9d-7c4d-ad4c-52cc82345c41" xlink:to="loc_ifrs-full_ChangesInPropertyPlantAndEquipment_01a13f14-65d2-74c7-b114-8c1e79bd895c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpenseArisingFromExplorationForAndEvaluationOfMineralResources_01a057fa-b880-7025-abda-f5004569a3d2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpenseArisingFromExplorationForAndEvaluationOfMineralResources"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfExplorationAndEvaluationAssetsLineItems_01a03970-9e9d-7c4d-ad4c-52cc82345c41" xlink:to="loc_ifrs-full_ExpenseArisingFromExplorationForAndEvaluationOfMineralResources_01a057fa-b880-7025-abda-f5004569a3d2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_IncreaseDecreaseThroughForeignExchangeAndOtherMovementsAssets_01a03970-9e9d-7ab5-94ba-7fcf31938cff" xlink:href="cve-20260930.xsd#cve_IncreaseDecreaseThroughForeignExchangeAndOtherMovementsAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfExplorationAndEvaluationAssetsLineItems_01a03970-9e9d-7c4d-ad4c-52cc82345c41" xlink:to="loc_cve_IncreaseDecreaseThroughForeignExchangeAndOtherMovementsAssets_01a03970-9e9d-7ab5-94ba-7fcf31938cff" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleExplorationAndEvaluationAssets_01a03970-9e9d-796a-aa09-4eb9cc897004" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleExplorationAndEvaluationAssets"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/PROPERTYPLANTANDEQUIPMENTNETDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#PROPERTYPLANTANDEQUIPMENTNETDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/PROPERTYPLANTANDEQUIPMENTNETDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_01a03970-9e9d-75cc-9b09-a08ce0969ebf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_01a03970-9e9d-7fee-b8ab-fc81a84e88ac" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_01a03970-9e9d-75cc-9b09-a08ce0969ebf" xlink:to="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_01a03970-9e9d-7fee-b8ab-fc81a84e88ac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_01a03970-9e9d-7b09-8de2-0a6fd78298d9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_01a03970-9e9d-7fee-b8ab-fc81a84e88ac" xlink:to="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_01a03970-9e9d-7b09-8de2-0a6fd78298d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a03970-9e9d-7b09-8de2-0a6fd78298d9_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_01a03970-9e9d-7b09-8de2-0a6fd78298d9" xlink:to="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a03970-9e9d-7b09-8de2-0a6fd78298d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a03970-9e9d-7e8e-87c4-24050e33859b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_01a03970-9e9d-7b09-8de2-0a6fd78298d9" xlink:to="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a03970-9e9d-7e8e-87c4-24050e33859b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentMember_01a03970-9e9d-71da-82d6-f8398f2d9885" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a03970-9e9d-7e8e-87c4-24050e33859b" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentMember_01a03970-9e9d-71da-82d6-f8398f2d9885" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OilAndGasAssetsMember_01a03970-9e9d-7852-bb2b-31127735267b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OilAndGasAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_01a03970-9e9d-71da-82d6-f8398f2d9885" xlink:to="loc_ifrs-full_OilAndGasAssetsMember_01a03970-9e9d-7852-bb2b-31127735267b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ProcessingTransportationAndStorageAssetsMember_01a03970-9e9d-7ca8-8498-51e48aa9698f" xlink:href="cve-20260930.xsd#cve_ProcessingTransportationAndStorageAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_01a03970-9e9d-71da-82d6-f8398f2d9885" xlink:to="loc_cve_ProcessingTransportationAndStorageAssetsMember_01a03970-9e9d-7ca8-8498-51e48aa9698f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ManufacturingAssetsMember_01a03970-9e9d-76e4-94e1-a7c8291703d0" xlink:href="cve-20260930.xsd#cve_ManufacturingAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_01a03970-9e9d-71da-82d6-f8398f2d9885" xlink:to="loc_cve_ManufacturingAssetsMember_01a03970-9e9d-76e4-94e1-a7c8291703d0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RetailAndOtherPropertyPlantAndEquipmentMember_01a03970-9e9d-7400-9d5b-922f3152ec38" xlink:href="cve-20260930.xsd#cve_RetailAndOtherPropertyPlantAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PropertyPlantAndEquipmentMember_01a03970-9e9d-71da-82d6-f8398f2d9885" xlink:to="loc_cve_RetailAndOtherPropertyPlantAndEquipmentMember_01a03970-9e9d-7400-9d5b-922f3152ec38" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01a03970-9e9d-7b13-98cb-966f2208e388" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_01a03970-9e9d-7fee-b8ab-fc81a84e88ac" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01a03970-9e9d-7b13-98cb-966f2208e388" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_01a03970-9e9d-7b13-98cb-966f2208e388_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01a03970-9e9d-7b13-98cb-966f2208e388" xlink:to="loc_ifrs-full_CarryingAmountMember_01a03970-9e9d-7b13-98cb-966f2208e388_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_01a03970-9e9d-75d3-9bbb-27ce0e67bb50" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01a03970-9e9d-7b13-98cb-966f2208e388" xlink:to="loc_ifrs-full_CarryingAmountMember_01a03970-9e9d-75d3-9bbb-27ce0e67bb50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_01a03970-9e9d-702a-bfcb-367feb50d442" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_01a03970-9e9d-75d3-9bbb-27ce0e67bb50" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_01a03970-9e9d-702a-bfcb-367feb50d442" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember_01a03970-9e9d-768d-9fc9-9b49db28459f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedDepreciationAndAmortisationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_01a03970-9e9d-75d3-9bbb-27ce0e67bb50" xlink:to="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember_01a03970-9e9d-768d-9fc9-9b49db28459f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipment_01a03970-9e9d-7d3f-892a-81965dc78153" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_01a03970-9e9d-75cc-9b09-a08ce0969ebf" xlink:to="loc_ifrs-full_PropertyPlantAndEquipment_01a03970-9e9d-7d3f-892a-81965dc78153" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment_01a03970-9e9d-750c-8505-7d82cf136ca9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_01a03970-9e9d-75cc-9b09-a08ce0969ebf" xlink:to="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment_01a03970-9e9d-750c-8505-7d82cf136ca9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_01a03970-9e9d-7042-843e-18d3d3a05745" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_01a03970-9e9d-75cc-9b09-a08ce0969ebf" xlink:to="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_01a03970-9e9d-7042-843e-18d3d3a05745" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ChangesInPropertyPlantAndEquipment_01a130a8-ff92-780f-af7f-d67dba2df431" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ChangesInPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_01a03970-9e9d-75cc-9b09-a08ce0969ebf" xlink:to="loc_ifrs-full_ChangesInPropertyPlantAndEquipment_01a130a8-ff92-780f-af7f-d67dba2df431" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_IncreaseDecreaseThroughDecommissioningLiabilitiesPropertyPlantAndEquipment_01a03970-9e9d-7ad3-a1df-db71b8cbe2a9" xlink:href="cve-20260930.xsd#cve_IncreaseDecreaseThroughDecommissioningLiabilitiesPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_01a03970-9e9d-75cc-9b09-a08ce0969ebf" xlink:to="loc_cve_IncreaseDecreaseThroughDecommissioningLiabilitiesPropertyPlantAndEquipment_01a03970-9e9d-7ad3-a1df-db71b8cbe2a9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisposalsPropertyPlantAndEquipment_01a03970-9e9d-7de6-981a-bc6723752156" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisposalsPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_01a03970-9e9d-75cc-9b09-a08ce0969ebf" xlink:to="loc_ifrs-full_DisposalsPropertyPlantAndEquipment_01a03970-9e9d-7de6-981a-bc6723752156" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment_01a03970-9e9d-75f0-a056-4a75ffe81302" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_01a03970-9e9d-75cc-9b09-a08ce0969ebf" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughOtherChangesPropertyPlantAndEquipment_01a03970-9e9d-75f0-a056-4a75ffe81302" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepreciationPropertyPlantAndEquipment_01a03970-9e9d-7225-a8e2-c2a3d9aa4db1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepreciationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_01a03970-9e9d-75cc-9b09-a08ce0969ebf" xlink:to="loc_ifrs-full_DepreciationPropertyPlantAndEquipment_01a03970-9e9d-7225-a8e2-c2a3d9aa4db1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipment_01a03970-9e9d-7528-8f4f-8d056ed24f00" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipment"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/LEASESScheduleofRightofUseAssetsNetDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#LEASESScheduleofRightofUseAssetsNetDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/LEASESScheduleofRightofUseAssetsNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems_01a03970-9e9d-7930-aa2a-0dd58f3aebf6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsTable_01a03970-9e9d-7345-b671-3941df29839f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems_01a03970-9e9d-7930-aa2a-0dd58f3aebf6" xlink:to="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsTable_01a03970-9e9d-7345-b671-3941df29839f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsAxis_01a03970-9e9d-7551-9de2-0127d1ba4630" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsTable_01a03970-9e9d-7345-b671-3941df29839f" xlink:to="loc_ifrs-full_ClassesOfAssetsAxis_01a03970-9e9d-7551-9de2-0127d1ba4630" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsDomain_01a03970-9e9d-7551-9de2-0127d1ba4630_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis_01a03970-9e9d-7551-9de2-0127d1ba4630" xlink:to="loc_ifrs-full_ClassesOfAssetsDomain_01a03970-9e9d-7551-9de2-0127d1ba4630_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsDomain_01a03970-9e9d-7a48-8da6-c23e8dea1708" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis_01a03970-9e9d-7551-9de2-0127d1ba4630" xlink:to="loc_ifrs-full_ClassesOfAssetsDomain_01a03970-9e9d-7a48-8da6-c23e8dea1708" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RealEstateLeaseMember_01a0581c-ad64-7a2f-b4df-82edb6f4beeb" xlink:href="cve-20260930.xsd#cve_RealEstateLeaseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_01a03970-9e9d-7a48-8da6-c23e8dea1708" xlink:to="loc_cve_RealEstateLeaseMember_01a0581c-ad64-7a2f-b4df-82edb6f4beeb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TransportationAndStorageAssetsMember_01a03970-9e9d-79f9-a77b-2d59aaa2de4b" xlink:href="cve-20260930.xsd#cve_TransportationAndStorageAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_01a03970-9e9d-7a48-8da6-c23e8dea1708" xlink:to="loc_cve_TransportationAndStorageAssetsMember_01a03970-9e9d-79f9-a77b-2d59aaa2de4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RefiningAssetsMember_01a03970-9e9d-743a-9261-62417504b308" xlink:href="cve-20260930.xsd#cve_RefiningAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_01a03970-9e9d-7a48-8da6-c23e8dea1708" xlink:to="loc_cve_RefiningAssetsMember_01a03970-9e9d-743a-9261-62417504b308" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RetailAndOtherAssetsMember_01a03970-9e9d-760d-81d0-bf5bfd7445c0" xlink:href="cve-20260930.xsd#cve_RetailAndOtherAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_01a03970-9e9d-7a48-8da6-c23e8dea1708" xlink:to="loc_cve_RetailAndOtherAssetsMember_01a03970-9e9d-760d-81d0-bf5bfd7445c0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01a03970-9e9d-7918-a61c-ba0289416d7f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsTable_01a03970-9e9d-7345-b671-3941df29839f" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01a03970-9e9d-7918-a61c-ba0289416d7f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_01a03970-9e9d-7918-a61c-ba0289416d7f_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01a03970-9e9d-7918-a61c-ba0289416d7f" xlink:to="loc_ifrs-full_CarryingAmountMember_01a03970-9e9d-7918-a61c-ba0289416d7f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_01a03970-9e9d-711c-b08f-a57de086bed0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01a03970-9e9d-7918-a61c-ba0289416d7f" xlink:to="loc_ifrs-full_CarryingAmountMember_01a03970-9e9d-711c-b08f-a57de086bed0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_01a03970-9e9d-7d93-baa7-09fc3f6a1889" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_01a03970-9e9d-711c-b08f-a57de086bed0" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_01a03970-9e9d-7d93-baa7-09fc3f6a1889" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AccumulatedDepreciationMember_01a03970-9e9d-7dc1-94e7-5d6b958fa53b" xlink:href="cve-20260930.xsd#cve_AccumulatedDepreciationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_01a03970-9e9d-711c-b08f-a57de086bed0" xlink:to="loc_cve_AccumulatedDepreciationMember_01a03970-9e9d-7dc1-94e7-5d6b958fa53b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RightofuseAssets_01a03970-9e9d-7618-91c5-ba574e342a63" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems_01a03970-9e9d-7930-aa2a-0dd58f3aebf6" xlink:to="loc_ifrs-full_RightofuseAssets_01a03970-9e9d-7618-91c5-ba574e342a63" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AccumulatedDepreciationRightOfUseAsset_01a03970-9e9d-7694-a704-4877f9e6d571" xlink:href="cve-20260930.xsd#cve_AccumulatedDepreciationRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems_01a03970-9e9d-7930-aa2a-0dd58f3aebf6" xlink:to="loc_cve_AccumulatedDepreciationRightOfUseAsset_01a03970-9e9d-7694-a704-4877f9e6d571" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdditionsToRightofuseAssets_01a03970-9e9d-7a60-a552-e9f5c639dd8b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionsToRightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems_01a03970-9e9d-7930-aa2a-0dd58f3aebf6" xlink:to="loc_ifrs-full_AdditionsToRightofuseAssets_01a03970-9e9d-7a60-a552-e9f5c639dd8b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInRightofuseAssets_01a0581c-ad64-717b-aa02-44f60e8c5c7a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseInRightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems_01a03970-9e9d-7930-aa2a-0dd58f3aebf6" xlink:to="loc_ifrs-full_IncreaseDecreaseInRightofuseAssets_01a0581c-ad64-717b-aa02-44f60e8c5c7a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RightOfUseAssetDivestitures_01a13f22-ab35-7780-9db6-ce1fab47bc15" xlink:href="cve-20260930.xsd#cve_RightOfUseAssetDivestitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems_01a03970-9e9d-7930-aa2a-0dd58f3aebf6" xlink:to="loc_cve_RightOfUseAssetDivestitures_01a13f22-ab35-7780-9db6-ce1fab47bc15" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepreciationRightofuseAssets_01a03970-9e9d-7064-9d5b-c733cfc4af71" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepreciationRightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems_01a03970-9e9d-7930-aa2a-0dd58f3aebf6" xlink:to="loc_ifrs-full_DepreciationRightofuseAssets_01a03970-9e9d-7064-9d5b-c733cfc4af71" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_IncreaseDecreaseThroughForeignExchangeAndOtherMovementsRightOfUseAsset_01a03970-9e9d-79ff-b5a1-90e653909321" xlink:href="cve-20260930.xsd#cve_IncreaseDecreaseThroughForeignExchangeAndOtherMovementsRightOfUseAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems_01a03970-9e9d-7930-aa2a-0dd58f3aebf6" xlink:to="loc_cve_IncreaseDecreaseThroughForeignExchangeAndOtherMovementsRightOfUseAsset_01a03970-9e9d-79ff-b5a1-90e653909321" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RightofuseAssets_01a03970-9e9d-7bbc-827d-c7ac37b3eeb2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RightofuseAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AccumulatedDepreciationRightOfUseAsset_01a03970-9e9d-73ba-8b31-e93447f5519d" xlink:href="cve-20260930.xsd#cve_AccumulatedDepreciationRightOfUseAsset"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/DEBTANDCAPITALSTRUCTUREAdditionalInformationDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#DEBTANDCAPITALSTRUCTUREAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/DEBTANDCAPITALSTRUCTUREAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-74bb-8046-91fd647a336a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a03970-9e9d-7a74-859e-366b209329f2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-74bb-8046-91fd647a336a" xlink:to="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a03970-9e9d-7a74-859e-366b209329f2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a03970-9e9d-7907-be26-670010fd631c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a03970-9e9d-7a74-859e-366b209329f2" xlink:to="loc_srt_RangeAxis_01a03970-9e9d-7907-be26-670010fd631c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a03970-9e9d-7907-be26-670010fd631c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a03970-9e9d-7907-be26-670010fd631c" xlink:to="loc_srt_RangeMember_01a03970-9e9d-7907-be26-670010fd631c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a03970-9e9d-7c49-a6ae-3fe7243f94a8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a03970-9e9d-7907-be26-670010fd631c" xlink:to="loc_srt_RangeMember_01a03970-9e9d-7c49-a6ae-3fe7243f94a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a03970-9e9d-786b-a8d1-9266efbda171" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a03970-9e9d-7c49-a6ae-3fe7243f94a8" xlink:to="loc_srt_MaximumMember_01a03970-9e9d-786b-a8d1-9266efbda171" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeAxis_01a03970-9e9d-7d2f-aef4-727abbba0e11" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a03970-9e9d-7a74-859e-366b209329f2" xlink:to="loc_ifrs-full_RangeAxis_01a03970-9e9d-7d2f-aef4-727abbba0e11" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_01a03970-9e9d-7d2f-aef4-727abbba0e11_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_01a03970-9e9d-7d2f-aef4-727abbba0e11" xlink:to="loc_ifrs-full_RangeDomain_01a03970-9e9d-7d2f-aef4-727abbba0e11_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_01a03970-9e9d-73f8-9d4a-533c6ee957d0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_01a03970-9e9d-7d2f-aef4-727abbba0e11" xlink:to="loc_ifrs-full_RangeDomain_01a03970-9e9d-73f8-9d4a-533c6ee957d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TopOfRangeMember_01a03970-9e9d-7441-808b-d6295df421a4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_01a03970-9e9d-73f8-9d4a-533c6ee957d0" xlink:to="loc_ifrs-full_TopOfRangeMember_01a03970-9e9d-7441-808b-d6295df421a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameAxis_01a03970-9e9d-76e4-988e-3cb69e4a3a9e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a03970-9e9d-7a74-859e-366b209329f2" xlink:to="loc_ifrs-full_BorrowingsByNameAxis_01a03970-9e9d-76e4-988e-3cb69e4a3a9e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-76e4-988e-3cb69e4a3a9e_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_01a03970-9e9d-76e4-988e-3cb69e4a3a9e" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-76e4-988e-3cb69e4a3a9e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-7361-9ff3-81d7a4c19eaa" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_01a03970-9e9d-76e4-988e-3cb69e4a3a9e" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-7361-9ff3-81d7a4c19eaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_UncommittedDemandFacilityMember_01a03970-9e9d-7c52-97df-2a9d38aa2fb9" xlink:href="cve-20260930.xsd#cve_UncommittedDemandFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-7361-9ff3-81d7a4c19eaa" xlink:to="loc_cve_UncommittedDemandFacilityMember_01a03970-9e9d-7c52-97df-2a9d38aa2fb9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CommittedCreditFacilitiesMaturingNovember102025Member_01a03970-9e9d-7895-875a-09d9c667b51b" xlink:href="cve-20260930.xsd#cve_CommittedCreditFacilitiesMaturingNovember102025Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-7361-9ff3-81d7a4c19eaa" xlink:to="loc_cve_CommittedCreditFacilitiesMaturingNovember102025Member_01a03970-9e9d-7895-875a-09d9c667b51b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CommittedCreditFacilitiesMaturingNovember102026Member_01a03970-9e9d-7565-9984-41dadb9e5732" xlink:href="cve-20260930.xsd#cve_CommittedCreditFacilitiesMaturingNovember102026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-7361-9ff3-81d7a4c19eaa" xlink:to="loc_cve_CommittedCreditFacilitiesMaturingNovember102026Member_01a03970-9e9d-7565-9984-41dadb9e5732" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CommittedCreditFacilitiesMember_01a03970-9e9d-76be-bfce-da065d2e7c03" xlink:href="cve-20260930.xsd#cve_CommittedCreditFacilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-7361-9ff3-81d7a4c19eaa" xlink:to="loc_cve_CommittedCreditFacilitiesMember_01a03970-9e9d-76be-bfce-da065d2e7c03" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TermLoanFacilityMember_01a07b3a-8459-7120-897e-3333493086bb" xlink:href="cve-20260930.xsd#cve_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-7361-9ff3-81d7a4c19eaa" xlink:to="loc_cve_TermLoanFacilityMember_01a07b3a-8459-7120-897e-3333493086bb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_USDollarDenominatedUnsecuredNotesMember_01a03970-9e9d-72dc-bab3-4dcbdb0b902b" xlink:href="cve-20260930.xsd#cve_USDollarDenominatedUnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-7361-9ff3-81d7a4c19eaa" xlink:to="loc_cve_USDollarDenominatedUnsecuredNotesMember_01a03970-9e9d-72dc-bab3-4dcbdb0b902b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointVenturesAxis_01a03970-9e9d-7af3-914f-09cd8367d3db" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointVenturesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a03970-9e9d-7a74-859e-366b209329f2" xlink:to="loc_ifrs-full_JointVenturesAxis_01a03970-9e9d-7af3-914f-09cd8367d3db" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointVenturesDomain_01a03970-9e9d-7af3-914f-09cd8367d3db_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_JointVenturesAxis_01a03970-9e9d-7af3-914f-09cd8367d3db" xlink:to="loc_ifrs-full_JointVenturesDomain_01a03970-9e9d-7af3-914f-09cd8367d3db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointVenturesDomain_01a03970-9e9d-7ef2-a10d-9021db9eb8b4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_JointVenturesAxis_01a03970-9e9d-7af3-914f-09cd8367d3db" xlink:to="loc_ifrs-full_JointVenturesDomain_01a03970-9e9d-7ef2-a10d-9021db9eb8b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_WRBRefiningLPMember_01a03970-9e9d-73e7-8c08-307fa48b96ce" xlink:href="cve-20260930.xsd#cve_WRBRefiningLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_JointVenturesDomain_01a03970-9e9d-7ef2-a10d-9021db9eb8b4" xlink:to="loc_cve_WRBRefiningLPMember_01a03970-9e9d-73e7-8c08-307fa48b96ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointOperationsAxis_01a03970-9e9d-7225-a491-e36cb16b2896" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a03970-9e9d-7a74-859e-366b209329f2" xlink:to="loc_ifrs-full_JointOperationsAxis_01a03970-9e9d-7225-a491-e36cb16b2896" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointOperationsDomain_01a03970-9e9d-7225-a491-e36cb16b2896_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointOperationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_JointOperationsAxis_01a03970-9e9d-7225-a491-e36cb16b2896" xlink:to="loc_ifrs-full_JointOperationsDomain_01a03970-9e9d-7225-a491-e36cb16b2896_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointOperationsDomain_01a03970-9e9d-7bac-8cd1-09ed0463593c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointOperationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_JointOperationsAxis_01a03970-9e9d-7225-a491-e36cb16b2896" xlink:to="loc_ifrs-full_JointOperationsDomain_01a03970-9e9d-7bac-8cd1-09ed0463593c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_WRBRefiningLPMember_01a03970-9e9d-79a2-827a-4a3d083dc281" xlink:href="cve-20260930.xsd#cve_WRBRefiningLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_JointOperationsDomain_01a03970-9e9d-7bac-8cd1-09ed0463593c" xlink:to="loc_cve_WRBRefiningLPMember_01a03970-9e9d-79a2-827a-4a3d083dc281" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityAxis_01a03970-9e9d-7442-8633-a61a7e5d22a5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a03970-9e9d-7a74-859e-366b209329f2" xlink:to="loc_ifrs-full_MaturityAxis_01a03970-9e9d-7442-8633-a61a7e5d22a5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain_01a03970-9e9d-7442-8633-a61a7e5d22a5_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_01a03970-9e9d-7442-8633-a61a7e5d22a5" xlink:to="loc_ifrs-full_MaturityDomain_01a03970-9e9d-7442-8633-a61a7e5d22a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain_01a03970-9e9d-7ede-b5ab-94582897f43a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_01a03970-9e9d-7442-8633-a61a7e5d22a5" xlink:to="loc_ifrs-full_MaturityDomain_01a03970-9e9d-7ede-b5ab-94582897f43a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_FivePointThreeEightPercentageDueJulyFifteenTwoThousandTwentyFiveMember_01a03970-9e9d-7bda-b887-3ade91ca94ec" xlink:href="cve-20260930.xsd#cve_FivePointThreeEightPercentageDueJulyFifteenTwoThousandTwentyFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a03970-9e9d-7ede-b5ab-94582897f43a" xlink:to="loc_cve_FivePointThreeEightPercentageDueJulyFifteenTwoThousandTwentyFiveMember_01a03970-9e9d-7bda-b887-3ade91ca94ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9e9d-739f-9af7-5da73f2b8ad2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a03970-9e9d-7a74-859e-366b209329f2" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9e9d-739f-9af7-5da73f2b8ad2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9d-739f-9af7-5da73f2b8ad2_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9e9d-739f-9af7-5da73f2b8ad2" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9d-739f-9af7-5da73f2b8ad2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9d-73dd-90b2-7b10bf63d8f9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9e9d-739f-9af7-5da73f2b8ad2" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9d-73dd-90b2-7b10bf63d8f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermBorrowingsMember_01a03970-9e9d-73ab-8d59-e01c96a88355" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9d-73dd-90b2-7b10bf63d8f9" xlink:to="loc_ifrs-full_LongtermBorrowingsMember_01a03970-9e9d-73ab-8d59-e01c96a88355" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_BorrowingFacilitiesMaximumBorrowingCapacity_01a03970-9e9d-7c7a-b701-86379ee35700" xlink:href="cve-20260930.xsd#cve_BorrowingFacilitiesMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-74bb-8046-91fd647a336a" xlink:to="loc_cve_BorrowingFacilitiesMaximumBorrowingCapacity_01a03970-9e9d-7c7a-b701-86379ee35700" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_UndrawnBorrowingFacilitiesForGeneralPurposes_01a03970-9e9d-7356-a576-aa30822cff56" xlink:href="cve-20260930.xsd#cve_UndrawnBorrowingFacilitiesForGeneralPurposes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-74bb-8046-91fd647a336a" xlink:to="loc_cve_UndrawnBorrowingFacilitiesForGeneralPurposes_01a03970-9e9d-7356-a576-aa30822cff56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_LettersOfCreditIssuedAsSecurityForPerformance_01a03970-9e9d-786d-9634-996946b1f5e7" xlink:href="cve-20260930.xsd#cve_LettersOfCreditIssuedAsSecurityForPerformance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-74bb-8046-91fd647a336a" xlink:to="loc_cve_LettersOfCreditIssuedAsSecurityForPerformance_01a03970-9e9d-786d-9634-996946b1f5e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShorttermBorrowings_01a03970-9e9d-7f0d-8fb6-8e5d4ef9f701" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShorttermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-74bb-8046-91fd647a336a" xlink:to="loc_ifrs-full_ShorttermBorrowings_01a03970-9e9d-7f0d-8fb6-8e5d4ef9f701" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_01a03970-9e9d-75e5-8518-ae4173b368c3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInJointVenture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-74bb-8046-91fd647a336a" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInJointVenture_01a03970-9e9d-75e5-8518-ae4173b368c3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_UndrawnBorrowingFacilitiesOutstanding_01a03970-9e9d-7b23-a0cf-ca37fcb2fbee" xlink:href="cve-20260930.xsd#cve_UndrawnBorrowingFacilitiesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-74bb-8046-91fd647a336a" xlink:to="loc_cve_UndrawnBorrowingFacilitiesOutstanding_01a03970-9e9d-7b23-a0cf-ca37fcb2fbee" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsInterestRate_01a03970-9e9d-7f0d-812f-7b8615ce7efa" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-74bb-8046-91fd647a336a" xlink:to="loc_ifrs-full_BorrowingsInterestRate_01a03970-9e9d-7f0d-812f-7b8615ce7efa" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_BorrowingRepaymentOfPrincipal_01a03970-9e9d-712f-8565-2d9c717705bc" xlink:href="cve-20260930.xsd#cve_BorrowingRepaymentOfPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-74bb-8046-91fd647a336a" xlink:to="loc_cve_BorrowingRepaymentOfPrincipal_01a03970-9e9d-712f-8565-2d9c717705bc" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_MaximumDebtToCapitalizationRatioPercentage_01a03970-9e9d-7bc3-a90f-8714967013f6" xlink:href="cve-20260930.xsd#cve_MaximumDebtToCapitalizationRatioPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-74bb-8046-91fd647a336a" xlink:to="loc_cve_MaximumDebtToCapitalizationRatioPercentage_01a03970-9e9d-7bc3-a90f-8714967013f6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TargetNetDebtToAdjustedEarningsBeforeInterestTaxesDepreciationDepletionAndAmortizationRatio_01a03970-9e9d-76c6-91e9-50694c4183ce" xlink:href="cve-20260930.xsd#cve_TargetNetDebtToAdjustedEarningsBeforeInterestTaxesDepreciationDepletionAndAmortizationRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-74bb-8046-91fd647a336a" xlink:to="loc_cve_TargetNetDebtToAdjustedEarningsBeforeInterestTaxesDepreciationDepletionAndAmortizationRatio_01a03970-9e9d-76c6-91e9-50694c4183ce" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TargetNetDebt_01a03970-9e9d-7123-8538-dba23ddd9916" xlink:href="cve-20260930.xsd#cve_TargetNetDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-74bb-8046-91fd647a336a" xlink:to="loc_cve_TargetNetDebt_01a03970-9e9d-7123-8538-dba23ddd9916" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AverageCrudeOilPrice_01a03970-9e9d-73cd-b3f9-f7bf3bff6f86" xlink:href="cve-20260930.xsd#cve_AverageCrudeOilPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-74bb-8046-91fd647a336a" xlink:to="loc_cve_AverageCrudeOilPrice_01a03970-9e9d-73cd-b3f9-f7bf3bff6f86" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/DEBTANDCAPITALSTRUCTUREScheduleofLongTermDebtDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#DEBTANDCAPITALSTRUCTUREScheduleofLongTermDebtDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/DEBTANDCAPITALSTRUCTUREScheduleofLongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-7c69-bcfe-7b3b61abfed7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a03970-9e9d-7032-b3e1-b17aeace20da" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-7c69-bcfe-7b3b61abfed7" xlink:to="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a03970-9e9d-7032-b3e1-b17aeace20da" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9e9d-7a8e-a600-7c0e9746e9d8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a03970-9e9d-7032-b3e1-b17aeace20da" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9e9d-7a8e-a600-7c0e9746e9d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9d-7a8e-a600-7c0e9746e9d8_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9e9d-7a8e-a600-7c0e9746e9d8" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9d-7a8e-a600-7c0e9746e9d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9d-7735-83e6-f78c63856213" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9e9d-7a8e-a600-7c0e9746e9d8" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9d-7735-83e6-f78c63856213" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermBorrowingsMember_01a03970-9e9d-7c26-af1b-41238af7810b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9d-7735-83e6-f78c63856213" xlink:to="loc_ifrs-full_LongtermBorrowingsMember_01a03970-9e9d-7c26-af1b-41238af7810b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameAxis_01a03970-9e9d-7ba7-b00d-02dc9236ce14" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_01a03970-9e9d-7032-b3e1-b17aeace20da" xlink:to="loc_ifrs-full_BorrowingsByNameAxis_01a03970-9e9d-7ba7-b00d-02dc9236ce14" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-7ba7-b00d-02dc9236ce14_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_01a03970-9e9d-7ba7-b00d-02dc9236ce14" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-7ba7-b00d-02dc9236ce14_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-71ce-a798-1e94fb0bcf72" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_01a03970-9e9d-7ba7-b00d-02dc9236ce14" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-71ce-a798-1e94fb0bcf72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RevolvingTermDebtMember_01a03970-9e9d-7a03-8ec4-b6873666b5e4" xlink:href="cve-20260930.xsd#cve_RevolvingTermDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-71ce-a798-1e94fb0bcf72" xlink:to="loc_cve_RevolvingTermDebtMember_01a03970-9e9d-7a03-8ec4-b6873666b5e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_USDollarDenominatedUnsecuredNotesMember_01a03970-9e9d-7618-8b6b-52e9d2398351" xlink:href="cve-20260930.xsd#cve_USDollarDenominatedUnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-71ce-a798-1e94fb0bcf72" xlink:to="loc_cve_USDollarDenominatedUnsecuredNotesMember_01a03970-9e9d-7618-8b6b-52e9d2398351" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CanadianDollarUnsecuredNotesMember_01a03970-9e9d-73fd-87c3-6db79b4c3ca1" xlink:href="cve-20260930.xsd#cve_CanadianDollarUnsecuredNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-71ce-a798-1e94fb0bcf72" xlink:to="loc_cve_CanadianDollarUnsecuredNotesMember_01a03970-9e9d-73fd-87c3-6db79b4c3ca1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TermLoanFacilityMember_01a0583b-5c87-79ba-8e7a-ab962f27481d" xlink:href="cve-20260930.xsd#cve_TermLoanFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_01a03970-9e9d-71ce-a798-1e94fb0bcf72" xlink:to="loc_cve_TermLoanFacilityMember_01a0583b-5c87-79ba-8e7a-ab962f27481d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentPortionOfOtherNoncurrentBorrowings_01a03970-9e9d-7a71-8afd-0175c719a078" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentPortionOfOtherNoncurrentBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-7c69-bcfe-7b3b61abfed7" xlink:to="loc_ifrs-full_NoncurrentPortionOfOtherNoncurrentBorrowings_01a03970-9e9d-7a71-8afd-0175c719a078" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentPortionOfNoncurrentLoansReceived_01a0583b-5c87-716b-a5bb-a30f7ac7aefb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentPortionOfNoncurrentLoansReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-7c69-bcfe-7b3b61abfed7" xlink:to="loc_ifrs-full_NoncurrentPortionOfNoncurrentLoansReceived_01a0583b-5c87-716b-a5bb-a30f7ac7aefb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotesAndDebenturesIssued_01a03970-9e9d-73ee-acde-51e3faa89fab" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotesAndDebenturesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-7c69-bcfe-7b3b61abfed7" xlink:to="loc_ifrs-full_NotesAndDebenturesIssued_01a03970-9e9d-73ee-acde-51e3faa89fab" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DebtDiscountsAndTransactionCosts_01a03970-9e9d-79aa-8cf0-460fd938ca05" xlink:href="cve-20260930.xsd#cve_DebtDiscountsAndTransactionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-7c69-bcfe-7b3b61abfed7" xlink:to="loc_cve_DebtDiscountsAndTransactionCosts_01a03970-9e9d-79aa-8cf0-460fd938ca05" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_01a03970-9e9d-7ac7-9d01-d49fbffc7d09" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-7c69-bcfe-7b3b61abfed7" xlink:to="loc_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_01a03970-9e9d-7ac7-9d01-d49fbffc7d09" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentPortionOfLongtermBorrowings_01a03970-9e9d-77bd-8f75-c012dcc7c672" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentPortionOfLongtermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-7c69-bcfe-7b3b61abfed7" xlink:to="loc_ifrs-full_CurrentPortionOfLongtermBorrowings_01a03970-9e9d-77bd-8f75-c012dcc7c672" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermBorrowings_01a03970-9e9d-7d12-a604-6af4ef5cb1da" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_01a03970-9e9d-7c69-bcfe-7b3b61abfed7" xlink:to="loc_ifrs-full_LongtermBorrowings_01a03970-9e9d-7d12-a604-6af4ef5cb1da" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/DEBTANDCAPITALSTRUCTUREScheduleofNetDebttoAdjustedEBITDADetails" xlink:type="simple" xlink:href="cve-20260930.xsd#DEBTANDCAPITALSTRUCTUREScheduleofNetDebttoAdjustedEBITDADetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/DEBTANDCAPITALSTRUCTUREScheduleofNetDebttoAdjustedEBITDADetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalLineItems_01a03970-9e9d-7467-8a04-a25acd13d859" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalTable_01a03970-9e9d-7cb4-b1a1-eae86071abbd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalLineItems_01a03970-9e9d-7467-8a04-a25acd13d859" xlink:to="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalTable_01a03970-9e9d-7cb4-b1a1-eae86071abbd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CapitalRequirementsAxis_01a03970-9e9d-7297-92aa-90b74f786c12" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CapitalRequirementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalTable_01a03970-9e9d-7cb4-b1a1-eae86071abbd" xlink:to="loc_ifrs-full_CapitalRequirementsAxis_01a03970-9e9d-7297-92aa-90b74f786c12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CapitalRequirementsDomain_01a03970-9e9d-7297-92aa-90b74f786c12_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CapitalRequirementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CapitalRequirementsAxis_01a03970-9e9d-7297-92aa-90b74f786c12" xlink:to="loc_ifrs-full_CapitalRequirementsDomain_01a03970-9e9d-7297-92aa-90b74f786c12_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CapitalRequirementsDomain_01a03970-9e9d-798b-82f7-85829ef652f3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CapitalRequirementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CapitalRequirementsAxis_01a03970-9e9d-7297-92aa-90b74f786c12" xlink:to="loc_ifrs-full_CapitalRequirementsDomain_01a03970-9e9d-798b-82f7-85829ef652f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RollingTwelveMonthBasisMember_01a03970-9e9d-77d4-b26f-1b067862ec0f" xlink:href="cve-20260930.xsd#cve_RollingTwelveMonthBasisMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CapitalRequirementsDomain_01a03970-9e9d-798b-82f7-85829ef652f3" xlink:to="loc_cve_RollingTwelveMonthBasisMember_01a03970-9e9d-77d4-b26f-1b067862ec0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentPortionOfLongtermBorrowings_01a03970-9e9d-7070-b2d3-f3b04bac6f04" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentPortionOfLongtermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalLineItems_01a03970-9e9d-7467-8a04-a25acd13d859" xlink:to="loc_ifrs-full_CurrentPortionOfLongtermBorrowings_01a03970-9e9d-7070-b2d3-f3b04bac6f04" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermBorrowings_01a03970-9e9d-7c0a-9d0f-3764e389cd41" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalLineItems_01a03970-9e9d-7467-8a04-a25acd13d859" xlink:to="loc_ifrs-full_LongtermBorrowings_01a03970-9e9d-7c0a-9d0f-3764e389cd41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Borrowings_01a03970-9e9d-7861-8cc9-265acd9353ce" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Borrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalLineItems_01a03970-9e9d-7467-8a04-a25acd13d859" xlink:to="loc_ifrs-full_Borrowings_01a03970-9e9d-7861-8cc9-265acd9353ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalents_01a03970-9e9d-7aa0-a70f-a347cd33b8de" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashAndCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalLineItems_01a03970-9e9d-7467-8a04-a25acd13d859" xlink:to="loc_ifrs-full_CashAndCashEquivalents_01a03970-9e9d-7aa0-a70f-a347cd33b8de" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NetDebt_01a03970-9e9d-78b5-8a5b-78dd78291634" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NetDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalLineItems_01a03970-9e9d-7467-8a04-a25acd13d859" xlink:to="loc_ifrs-full_NetDebt_01a03970-9e9d-78b5-8a5b-78dd78291634" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/ContingentPaymentsAdditionalInformationDetail" xlink:type="simple" xlink:href="cve-20260930.xsd#ContingentPaymentsAdditionalInformationDetail"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/ContingentPaymentsAdditionalInformationDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_01a03970-9e9d-7ea1-a0ba-8e110b438c16" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_01a03970-9e9d-7333-8130-a72a76272292" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_01a03970-9e9d-7ea1-a0ba-8e110b438c16" xlink:to="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_01a03970-9e9d-7333-8130-a72a76272292" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsAxis_01a03970-9e9d-7872-a42d-072d87a9f520" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_01a03970-9e9d-7333-8130-a72a76272292" xlink:to="loc_ifrs-full_BusinessCombinationsAxis_01a03970-9e9d-7872-a42d-072d87a9f520" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_01a03970-9e9d-7872-a42d-072d87a9f520_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_01a03970-9e9d-7872-a42d-072d87a9f520" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_01a03970-9e9d-7872-a42d-072d87a9f520_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_01a03970-9e9d-729b-8975-534d31aa9080" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_01a03970-9e9d-7872-a42d-072d87a9f520" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_01a03970-9e9d-729b-8975-534d31aa9080" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_BPCanadaMember_01a03970-9e9d-7e5f-8a50-6db04f0a2d3b" xlink:href="cve-20260930.xsd#cve_BPCanadaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_01a03970-9e9d-729b-8975-534d31aa9080" xlink:to="loc_cve_BPCanadaMember_01a03970-9e9d-7e5f-8a50-6db04f0a2d3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a03970-9e9d-7b65-8e2b-4b6236c409d5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationTable_01a03970-9e9d-7333-8130-a72a76272292" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a03970-9e9d-7b65-8e2b-4b6236c409d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a03970-9e9d-7b65-8e2b-4b6236c409d5_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a03970-9e9d-7b65-8e2b-4b6236c409d5" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a03970-9e9d-7b65-8e2b-4b6236c409d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a03970-9e9d-7ee8-b62a-a8f5563f0996" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a03970-9e9d-7b65-8e2b-4b6236c409d5" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a03970-9e9d-7ee8-b62a-a8f5563f0996" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MajorBusinessCombinationMember_01a03970-9e9d-7271-949c-88b1bab6208a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorBusinessCombinationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a03970-9e9d-7ee8-b62a-a8f5563f0996" xlink:to="loc_ifrs-full_MajorBusinessCombinationMember_01a03970-9e9d-7271-949c-88b1bab6208a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInJointOperation_01a03970-9e9d-7a1e-8207-657151e36433" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInJointOperation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_01a03970-9e9d-7ea1-a0ba-8e110b438c16" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInJointOperation_01a03970-9e9d-7a1e-8207-657151e36433" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SettledLiabilitiesContingentLiabilitiesRecognisedInBusinessCombination_01a03970-9e9d-7c62-9454-62f6cca5782c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SettledLiabilitiesContingentLiabilitiesRecognisedInBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesInBusinessCombinationLineItems_01a03970-9e9d-7ea1-a0ba-8e110b438c16" xlink:to="loc_ifrs-full_SettledLiabilitiesContingentLiabilitiesRecognisedInBusinessCombination_01a03970-9e9d-7c62-9454-62f6cca5782c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/SHARECAPITALANDWARRANTSAdditionalInformationDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#SHARECAPITALANDWARRANTSAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/SHARECAPITALANDWARRANTSAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-7a4f-b08b-f3eebd364c1d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-7a4f-b08b-f3eebd364c1d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis_01a05c91-06cc-7695-b4c4-8d604e5d0cb8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-7a4f-b08b-f3eebd364c1d" xlink:to="loc_ifrs-full_ClassesOfShareCapitalAxis_01a05c91-06cc-7695-b4c4-8d604e5d0cb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_01a05c91-06cc-7695-b4c4-8d604e5d0cb8_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_01a05c91-06cc-7695-b4c4-8d604e5d0cb8" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_01a05c91-06cc-7695-b4c4-8d604e5d0cb8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_01a05c91-06cc-7c48-894e-2bdc7760eb71" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_01a05c91-06cc-7695-b4c4-8d604e5d0cb8" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_01a05c91-06cc-7c48-894e-2bdc7760eb71" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_StockOptionPlanMember_01a05c91-06cc-7bba-b770-8560b878d08f" xlink:href="cve-20260930.xsd#cve_StockOptionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_01a05c91-06cc-7c48-894e-2bdc7760eb71" xlink:to="loc_cve_StockOptionPlanMember_01a05c91-06cc-7bba-b770-8560b878d08f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OrdinarySharesMember_01a05c91-6566-7b62-9e99-e437f404acb8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OrdinarySharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_01a05c91-06cc-7c48-894e-2bdc7760eb71" xlink:to="loc_ifrs-full_OrdinarySharesMember_01a05c91-6566-7b62-9e99-e437f404acb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PreferenceSharesMember_01a05c91-88c3-71b7-af4c-44ba881bb6c5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PreferenceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_01a05c91-06cc-7c48-894e-2bdc7760eb71" xlink:to="loc_ifrs-full_PreferenceSharesMember_01a05c91-88c3-71b7-af4c-44ba881bb6c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CommonShareWarrantsMember_01a05c91-a2d2-7696-8b54-a048edfc6cde" xlink:href="cve-20260930.xsd#cve_CommonShareWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_01a05c91-06cc-7c48-894e-2bdc7760eb71" xlink:to="loc_cve_CommonShareWarrantsMember_01a05c91-a2d2-7696-8b54-a048edfc6cde" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ShareRepurchaseByPlanAxis_01a05c91-6566-7f44-9c80-958959950a00" xlink:href="cve-20260930.xsd#cve_ShareRepurchaseByPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-7a4f-b08b-f3eebd364c1d" xlink:to="loc_cve_ShareRepurchaseByPlanAxis_01a05c91-6566-7f44-9c80-958959950a00" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ShareRepurchaseByPlanDomain_01a05c91-6566-7f44-9c80-958959950a00_default" xlink:href="cve-20260930.xsd#cve_ShareRepurchaseByPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cve_ShareRepurchaseByPlanAxis_01a05c91-6566-7f44-9c80-958959950a00" xlink:to="loc_cve_ShareRepurchaseByPlanDomain_01a05c91-6566-7f44-9c80-958959950a00_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ShareRepurchaseByPlanDomain_01a05c91-6566-70fc-a101-d45d256b12d0" xlink:href="cve-20260930.xsd#cve_ShareRepurchaseByPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cve_ShareRepurchaseByPlanAxis_01a05c91-6566-7f44-9c80-958959950a00" xlink:to="loc_cve_ShareRepurchaseByPlanDomain_01a05c91-6566-70fc-a101-d45d256b12d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RenewedNCIBMember_01a05c91-6566-712f-905b-cf5a9171e0f9" xlink:href="cve-20260930.xsd#cve_RenewedNCIBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ShareRepurchaseByPlanDomain_01a05c91-6566-70fc-a101-d45d256b12d0" xlink:to="loc_cve_RenewedNCIBMember_01a05c91-6566-712f-905b-cf5a9171e0f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a05c91-6566-7573-8ca0-0ee59e709d5a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-7a4f-b08b-f3eebd364c1d" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a05c91-6566-7573-8ca0-0ee59e709d5a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a05c91-6566-7573-8ca0-0ee59e709d5a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a05c91-6566-7573-8ca0-0ee59e709d5a" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a05c91-6566-7573-8ca0-0ee59e709d5a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a05c91-6566-7c86-a64a-9ab408e46f38" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_01a05c91-6566-7573-8ca0-0ee59e709d5a" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a05c91-6566-7c86-a64a-9ab408e46f38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PotentialOrdinaryShareTransactionsMember_01a05c91-6566-7ed6-8a3f-12a59464ffeb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PotentialOrdinaryShareTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_01a05c91-6566-7c86-a64a-9ab408e46f38" xlink:to="loc_ifrs-full_PotentialOrdinaryShareTransactionsMember_01a05c91-6566-7ed6-8a3f-12a59464ffeb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_SeriesOfShareCapitalSharesAxis_01a05c91-88c3-7942-a891-fe6ad63b4eee" xlink:href="cve-20260930.xsd#cve_SeriesOfShareCapitalSharesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-7a4f-b08b-f3eebd364c1d" xlink:to="loc_cve_SeriesOfShareCapitalSharesAxis_01a05c91-88c3-7942-a891-fe6ad63b4eee" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_SeriesOfShareCapitalSharesDomain_01a05c91-88c3-7942-a891-fe6ad63b4eee_default" xlink:href="cve-20260930.xsd#cve_SeriesOfShareCapitalSharesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cve_SeriesOfShareCapitalSharesAxis_01a05c91-88c3-7942-a891-fe6ad63b4eee" xlink:to="loc_cve_SeriesOfShareCapitalSharesDomain_01a05c91-88c3-7942-a891-fe6ad63b4eee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_SeriesOfShareCapitalSharesDomain_01a05c91-88c3-7178-a12e-904290f63735" xlink:href="cve-20260930.xsd#cve_SeriesOfShareCapitalSharesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cve_SeriesOfShareCapitalSharesAxis_01a05c91-88c3-7942-a891-fe6ad63b4eee" xlink:to="loc_cve_SeriesOfShareCapitalSharesDomain_01a05c91-88c3-7178-a12e-904290f63735" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_Series1PreferredSharesMember_01a07b4e-d46f-7cd5-81a2-cfc888462a5a" xlink:href="cve-20260930.xsd#cve_Series1PreferredSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_SeriesOfShareCapitalSharesDomain_01a05c91-88c3-7178-a12e-904290f63735" xlink:to="loc_cve_Series1PreferredSharesMember_01a07b4e-d46f-7cd5-81a2-cfc888462a5a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_Series2PreferredSharesMember_01a07b4e-d46f-7c7d-92d7-f56bc8609f18" xlink:href="cve-20260930.xsd#cve_Series2PreferredSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_SeriesOfShareCapitalSharesDomain_01a05c91-88c3-7178-a12e-904290f63735" xlink:to="loc_cve_Series2PreferredSharesMember_01a07b4e-d46f-7c7d-92d7-f56bc8609f18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_Series1And2FirstPreferredSharesMember_01a07b4e-1ec7-7cde-b2a1-35402205fe81" xlink:href="cve-20260930.xsd#cve_Series1And2FirstPreferredSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_SeriesOfShareCapitalSharesDomain_01a05c91-88c3-7178-a12e-904290f63735" xlink:to="loc_cve_Series1And2FirstPreferredSharesMember_01a07b4e-1ec7-7cde-b2a1-35402205fe81" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_PercentageOfOutstandingSharesAuthorizedForIssuance_01a05c91-250b-7488-9b62-4d14d1ce3fb7" xlink:href="cve-20260930.xsd#cve_PercentageOfOutstandingSharesAuthorizedForIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_cve_PercentageOfOutstandingSharesAuthorizedForIssuance_01a05c91-250b-7488-9b62-4d14d1ce3fb7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares_01a05c91-06cc-7f04-94fa-8b4e44bd9f70" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_ifrs-full_SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares_01a05c91-06cc-7f04-94fa-8b4e44bd9f70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_01a05c91-6566-7302-9d33-4b645de638bd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_srt_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased_01a05c91-6566-7302-9d33-4b645de638bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_StockRepurchaseProgramRepurchasedAmountSharesUnderNCIB_01a05c91-6566-75f5-bc55-e65aaa3439ab" xlink:href="cve-20260930.xsd#cve_StockRepurchaseProgramRepurchasedAmountSharesUnderNCIB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_cve_StockRepurchaseProgramRepurchasedAmountSharesUnderNCIB_01a05c91-6566-75f5-bc55-e65aaa3439ab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ShareRepurchaseProgramPricePerShare_01a05c91-6567-762b-9d5e-52e373a3f06e" xlink:href="cve-20260930.xsd#cve_ShareRepurchaseProgramPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_cve_ShareRepurchaseProgramPricePerShare_01a05c91-6567-762b-9d5e-52e373a3f06e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares_01a05c91-6567-73dc-b1e1-659864aaf5bc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PaymentsToAcquireOrRedeemEntitysShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_ifrs-full_PaymentsToAcquireOrRedeemEntitysShares_01a05c91-6567-73dc-b1e1-659864aaf5bc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ShareRepurchaseProgramReductionToRetainedEarnings_01a05c91-6567-706b-b8f8-f1b0f8460e3a" xlink:href="cve-20260930.xsd#cve_ShareRepurchaseProgramReductionToRetainedEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_cve_ShareRepurchaseProgramReductionToRetainedEarnings_01a05c91-6567-706b-b8f8-f1b0f8460e3a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ShareRepurchaseProgramReductionToContributedSurplusAverageCarryingValueAmount_01a05c91-6567-7e8f-920d-74a9e556b34c" xlink:href="cve-20260930.xsd#cve_ShareRepurchaseProgramReductionToContributedSurplusAverageCarryingValueAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_cve_ShareRepurchaseProgramReductionToContributedSurplusAverageCarryingValueAmount_01a05c91-6567-7e8f-920d-74a9e556b34c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ShareRepurchaseProgramReductionToContributedSurplusTaxesPaid_01a05c91-6567-747a-a580-038c4547e17e" xlink:href="cve-20260930.xsd#cve_ShareRepurchaseProgramReductionToContributedSurplusTaxesPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_cve_ShareRepurchaseProgramReductionToContributedSurplusTaxesPaid_01a05c91-6567-747a-a580-038c4547e17e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased1_01a05c91-6567-7251-83cb-573babe9f6c7" xlink:href="cve-20260930.xsd#cve_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_cve_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased1_01a05c91-6567-7251-83cb-573babe9f6c7" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_01a05c91-88c3-76bc-bcf7-f5b0623ddd51" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_ifrs-full_NumberOfSharesOutstanding_01a05c91-88c3-76bc-bcf7-f5b0623ddd51" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_PreferredSharesPricePerShare_01a05c91-88c3-75d7-9ea2-f877e2ca6f9c" xlink:href="cve-20260930.xsd#cve_PreferredSharesPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_cve_PreferredSharesPricePerShare_01a05c91-88c3-75d7-9ea2-f877e2ca6f9c" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarnings_01a05c91-88c3-7273-91d9-02051d42a623" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RetainedEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_ifrs-full_RetainedEarnings_01a05c91-88c3-7273-91d9-02051d42a623" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExercisePriceShareOptionsGranted2019_01a05c91-a2d2-7bec-aa8f-f1c2b8bf4d27" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExercisePriceShareOptionsGranted2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a05c91-06cc-7a3a-a4da-f41d05d771f6" xlink:to="loc_ifrs-full_ExercisePriceShareOptionsGranted2019_01a05c91-a2d2-7bec-aa8f-f1c2b8bf4d27" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/SHARECAPITALANDWARRANTSIssuedandOutstandingCommonSharesDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#SHARECAPITALANDWARRANTSIssuedandOutstandingCommonSharesDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/SHARECAPITALANDWARRANTSIssuedandOutstandingCommonSharesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-72b2-8c6d-752005a45397" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-7677-adb8-745f5f03e18c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-72b2-8c6d-752005a45397" xlink:to="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-7677-adb8-745f5f03e18c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9e9d-7fbf-aa56-5b4b344a3bf1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-7677-adb8-745f5f03e18c" xlink:to="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9e9d-7fbf-aa56-5b4b344a3bf1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-7fbf-aa56-5b4b344a3bf1_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9e9d-7fbf-aa56-5b4b344a3bf1" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-7fbf-aa56-5b4b344a3bf1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-7184-b4de-647975a890fd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9e9d-7fbf-aa56-5b4b344a3bf1" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-7184-b4de-647975a890fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OrdinarySharesMember_01a03970-9e9d-79e3-81be-0d1a00a5aefb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OrdinarySharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-7184-b4de-647975a890fd" xlink:to="loc_ifrs-full_OrdinarySharesMember_01a03970-9e9d-79e3-81be-0d1a00a5aefb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7cd9-99d5-b873b7b97cb6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesIssuedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-72b2-8c6d-752005a45397" xlink:to="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7cd9-99d5-b873b7b97cb6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_01a03970-9e9d-733e-b959-ec2b8f2384eb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7cd9-99d5-b873b7b97cb6" xlink:to="loc_ifrs-full_NumberOfSharesOutstanding_01a03970-9e9d-733e-b959-ec2b8f2384eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfSharesIssuedUnderArrangement_01a05c94-45b0-763e-a35d-3450417bf5de" xlink:href="cve-20260930.xsd#cve_NumberOfSharesIssuedUnderArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7cd9-99d5-b873b7b97cb6" xlink:to="loc_cve_NumberOfSharesIssuedUnderArrangement_01a05c94-45b0-763e-a35d-3450417bf5de" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfCommonSharesIssuedUponExerciseOfWarrants_01a03970-9e9d-79fb-a69a-db6dc0393173" xlink:href="cve-20260930.xsd#cve_NumberOfCommonSharesIssuedUponExerciseOfWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7cd9-99d5-b873b7b97cb6" xlink:to="loc_cve_NumberOfCommonSharesIssuedUponExerciseOfWarrants_01a03970-9e9d-79fb-a69a-db6dc0393173" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfCommonSharesIssuedUnderStockOptionsPlan_01a03970-9e9d-7feb-ae01-31a1e1a33f41" xlink:href="cve-20260930.xsd#cve_NumberOfCommonSharesIssuedUnderStockOptionsPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7cd9-99d5-b873b7b97cb6" xlink:to="loc_cve_NumberOfCommonSharesIssuedUnderStockOptionsPlan_01a03970-9e9d-7feb-ae01-31a1e1a33f41" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_StockRepurchaseProgramRepurchasedAmountSharesUnderNCIB_01a03970-9e9d-7827-a3f9-cc64ccc587ca" xlink:href="cve-20260930.xsd#cve_StockRepurchaseProgramRepurchasedAmountSharesUnderNCIB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7cd9-99d5-b873b7b97cb6" xlink:to="loc_cve_StockRepurchaseProgramRepurchasedAmountSharesUnderNCIB_01a03970-9e9d-7827-a3f9-cc64ccc587ca" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_StockRepurchaseProgramRepurchasedAmountSharesUnderASPP_01a13f2b-5d98-7b3b-ae77-228d49fcfb3b" xlink:href="cve-20260930.xsd#cve_StockRepurchaseProgramRepurchasedAmountSharesUnderASPP"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7cd9-99d5-b873b7b97cb6" xlink:to="loc_cve_StockRepurchaseProgramRepurchasedAmountSharesUnderASPP_01a13f2b-5d98-7b3b-ae77-228d49fcfb3b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_01a03970-9e9d-7e37-a1cb-27ac39d66bed" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-74bc-836e-4b2c13d4ba7d" xlink:href="cve-20260930.xsd#cve_ValueOfSharesIssuedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-72b2-8c6d-752005a45397" xlink:to="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-74bc-836e-4b2c13d4ba7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital_01a03970-9e9d-7a6e-905d-17a959f2e082" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-74bc-836e-4b2c13d4ba7d" xlink:to="loc_ifrs-full_IssuedCapital_01a03970-9e9d-7a6e-905d-17a959f2e082" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_SharesIssuedInAmountUnderArrangement_01a05c94-45b0-787d-90bb-6ae585a16965" xlink:href="cve-20260930.xsd#cve_SharesIssuedInAmountUnderArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-74bc-836e-4b2c13d4ba7d" xlink:to="loc_cve_SharesIssuedInAmountUnderArrangement_01a05c94-45b0-787d-90bb-6ae585a16965" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CommonSharesIssuedInAmountUponExerciseOfWarrants_01a03970-9e9d-7230-992b-9181d71e8a93" xlink:href="cve-20260930.xsd#cve_CommonSharesIssuedInAmountUponExerciseOfWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-74bc-836e-4b2c13d4ba7d" xlink:to="loc_cve_CommonSharesIssuedInAmountUponExerciseOfWarrants_01a03970-9e9d-7230-992b-9181d71e8a93" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CommonSharesIssuedInAmountUnderStockOptionPlan_01a03970-9e9d-7460-9c8b-32a5261f0410" xlink:href="cve-20260930.xsd#cve_CommonSharesIssuedInAmountUnderStockOptionPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-74bc-836e-4b2c13d4ba7d" xlink:to="loc_cve_CommonSharesIssuedInAmountUnderStockOptionPlan_01a03970-9e9d-7460-9c8b-32a5261f0410" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CommonSharesRepurchasedUnderNCIB_01a03970-9e9d-728f-ac24-a8d38d5710ea" xlink:href="cve-20260930.xsd#cve_CommonSharesRepurchasedUnderNCIB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-74bc-836e-4b2c13d4ba7d" xlink:to="loc_cve_CommonSharesRepurchasedUnderNCIB_01a03970-9e9d-728f-ac24-a8d38d5710ea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CommonSharesRepurchasedUnderASPP_01a13f2c-100e-7473-8181-80713ff054b2" xlink:href="cve-20260930.xsd#cve_CommonSharesRepurchasedUnderASPP"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-74bc-836e-4b2c13d4ba7d" xlink:to="loc_cve_CommonSharesRepurchasedUnderASPP_01a13f2c-100e-7473-8181-80713ff054b2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital_01a03970-9e9d-724d-b581-6d1f8ec57c9f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapital"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/SHARECAPITALANDWARRANTSScheduleofASPPRepurchasePlanDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#SHARECAPITALANDWARRANTSScheduleofASPPRepurchasePlanDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/SHARECAPITALANDWARRANTSScheduleofASPPRepurchasePlanDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a173de-8394-7631-af99-109f2f86b542" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a173de-8394-78ec-929e-972c9721a22f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a173de-8394-7631-af99-109f2f86b542" xlink:to="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a173de-8394-78ec-929e-972c9721a22f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_01a17940-fdde-7eb5-8297-eb2453936c7b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a173de-8394-78ec-929e-972c9721a22f" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_01a17940-fdde-7eb5-8297-eb2453936c7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_01a17940-fdde-7eb5-8297-eb2453936c7b_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_01a17940-fdde-7eb5-8297-eb2453936c7b" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_01a17940-fdde-7eb5-8297-eb2453936c7b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_01a17940-fdde-7575-b6e1-f4173bc5a44a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_01a17940-fdde-7eb5-8297-eb2453936c7b" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_01a17940-fdde-7575-b6e1-f4173bc5a44a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapitalMember_01a17941-3b74-716d-b6aa-ac71a132f41f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_01a17940-fdde-7575-b6e1-f4173bc5a44a" xlink:to="loc_ifrs-full_IssuedCapitalMember_01a17941-3b74-716d-b6aa-ac71a132f41f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarningsMember_01a17941-61f1-7db9-a1de-abd5ccc8a1fb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_01a17940-fdde-7575-b6e1-f4173bc5a44a" xlink:to="loc_ifrs-full_RetainedEarningsMember_01a17941-61f1-7db9-a1de-abd5ccc8a1fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtAmortisedCost_01a17940-add8-7efb-8ba3-62a4d3db0983" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtAmortisedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a173de-8394-7631-af99-109f2f86b542" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtAmortisedCost_01a17940-add8-7efb-8ba3-62a4d3db0983" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/SHARECAPITALANDWARRANTSTreasurySharesDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#SHARECAPITALANDWARRANTSTreasurySharesDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/SHARECAPITALANDWARRANTSTreasurySharesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-718b-9dbb-52c34fcfbb84" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-722a-8278-5c68e1dbc4b3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-718b-9dbb-52c34fcfbb84" xlink:to="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-722a-8278-5c68e1dbc4b3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_01a03970-9e9d-7f2a-b70d-1926af8e3c50" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-722a-8278-5c68e1dbc4b3" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_01a03970-9e9d-7f2a-b70d-1926af8e3c50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9e9d-7f2a-b70d-1926af8e3c50_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_01a03970-9e9d-7f2a-b70d-1926af8e3c50" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9e9d-7f2a-b70d-1926af8e3c50_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9e9d-7294-bf04-f45ae6a50ec0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_01a03970-9e9d-7f2a-b70d-1926af8e3c50" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9e9d-7294-bf04-f45ae6a50ec0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TreasurySharesMember_01a03970-9e9d-7aa2-952f-3bcf521d6826" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TreasurySharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9e9d-7294-bf04-f45ae6a50ec0" xlink:to="loc_ifrs-full_TreasurySharesMember_01a03970-9e9d-7aa2-952f-3bcf521d6826" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7617-9f6c-ee6c15991577" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesIssuedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-718b-9dbb-52c34fcfbb84" xlink:to="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7617-9f6c-ee6c15991577" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_01a03970-9e9d-707a-9e70-068cc57d5da9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7617-9f6c-ee6c15991577" xlink:to="loc_ifrs-full_NumberOfSharesOutstanding_01a03970-9e9d-707a-9e70-068cc57d5da9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfCommonSharesMarketPurchaseShares_01a03970-9e9d-774c-9b6c-9e9d6e6c0dce" xlink:href="cve-20260930.xsd#cve_NumberOfCommonSharesMarketPurchaseShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7617-9f6c-ee6c15991577" xlink:to="loc_cve_NumberOfCommonSharesMarketPurchaseShares_01a03970-9e9d-774c-9b6c-9e9d6e6c0dce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfCommonSharesMarketDistributedShares_01a03970-9e9d-77fb-8f63-9bdc5d05f9b6" xlink:href="cve-20260930.xsd#cve_NumberOfCommonSharesMarketDistributedShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7617-9f6c-ee6c15991577" xlink:to="loc_cve_NumberOfCommonSharesMarketDistributedShares_01a03970-9e9d-77fb-8f63-9bdc5d05f9b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_01a03970-9e9d-74e9-8b17-9a4983c4a5dd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-7c92-b88f-93f02a0f608a" xlink:href="cve-20260930.xsd#cve_ValueOfSharesIssuedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-718b-9dbb-52c34fcfbb84" xlink:to="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-7c92-b88f-93f02a0f608a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital_01a03970-9e9d-7731-b229-2794e5501e0f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-7c92-b88f-93f02a0f608a" xlink:to="loc_ifrs-full_IssuedCapital_01a03970-9e9d-7731-b229-2794e5501e0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfCommonSharesMarketPurchaseAmount_01a03970-9e9d-7f5c-a264-139f92366c9d" xlink:href="cve-20260930.xsd#cve_NumberOfCommonSharesMarketPurchaseAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-7c92-b88f-93f02a0f608a" xlink:to="loc_cve_NumberOfCommonSharesMarketPurchaseAmount_01a03970-9e9d-7f5c-a264-139f92366c9d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfCommonSharesMarketDistributedAmount_01a03970-9e9d-753e-b265-ec6681c97a6e" xlink:href="cve-20260930.xsd#cve_NumberOfCommonSharesMarketDistributedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-7c92-b88f-93f02a0f608a" xlink:to="loc_cve_NumberOfCommonSharesMarketDistributedAmount_01a03970-9e9d-753e-b265-ec6681c97a6e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital_01a03970-9e9d-70a6-8526-6cb8fd0f2adc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapital"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/SHARECAPITALANDWARRANTSFirstPreferredSharesDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#SHARECAPITALANDWARRANTSFirstPreferredSharesDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/SHARECAPITALANDWARRANTSFirstPreferredSharesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-75ba-9ca6-9c0d0737b4f9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-762b-8cfc-15e532f3da46" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-75ba-9ca6-9c0d0737b4f9" xlink:to="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-762b-8cfc-15e532f3da46" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9e9d-742c-8221-06be743af661" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-762b-8cfc-15e532f3da46" xlink:to="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9e9d-742c-8221-06be743af661" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-742c-8221-06be743af661_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9e9d-742c-8221-06be743af661" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-742c-8221-06be743af661_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-768a-b4a9-2d9f3f29e5d6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9e9d-742c-8221-06be743af661" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-768a-b4a9-2d9f3f29e5d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PreferenceSharesMember_01a03970-9e9d-7104-a8fc-e662596da81c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PreferenceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-768a-b4a9-2d9f3f29e5d6" xlink:to="loc_ifrs-full_PreferenceSharesMember_01a03970-9e9d-7104-a8fc-e662596da81c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7454-8cb5-560956896405" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesIssuedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-75ba-9ca6-9c0d0737b4f9" xlink:to="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7454-8cb5-560956896405" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_01a03970-9e9d-7c68-972c-1941b47575f7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7454-8cb5-560956896405" xlink:to="loc_ifrs-full_NumberOfSharesOutstanding_01a03970-9e9d-7c68-972c-1941b47575f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfCommonSharesPurchasedAndCancelledShares_01a03970-9e9d-72d2-b54f-88458a685cec" xlink:href="cve-20260930.xsd#cve_NumberOfCommonSharesPurchasedAndCancelledShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7454-8cb5-560956896405" xlink:to="loc_cve_NumberOfCommonSharesPurchasedAndCancelledShares_01a03970-9e9d-72d2-b54f-88458a685cec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_01a03970-9e9d-7c8f-a2d5-d706783c0c70" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-7075-98f3-6506d6b15157" xlink:href="cve-20260930.xsd#cve_ValueOfSharesIssuedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-75ba-9ca6-9c0d0737b4f9" xlink:to="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-7075-98f3-6506d6b15157" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital_01a03970-9e9d-79b9-9587-b164463d1410" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-7075-98f3-6506d6b15157" xlink:to="loc_ifrs-full_IssuedCapital_01a03970-9e9d-79b9-9587-b164463d1410" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfCommonSharesPurchasedAndCancelledAmount_01a03970-9e9d-7ae8-9a0a-040c6574a4a0" xlink:href="cve-20260930.xsd#cve_NumberOfCommonSharesPurchasedAndCancelledAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-7075-98f3-6506d6b15157" xlink:to="loc_cve_NumberOfCommonSharesPurchasedAndCancelledAmount_01a03970-9e9d-7ae8-9a0a-040c6574a4a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital_01a03970-9e9d-7ced-a1fe-b418b740495f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapital"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/SHARECAPITALANDWARRANTSIssuedandOutstandingWarrantsDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#SHARECAPITALANDWARRANTSIssuedandOutstandingWarrantsDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/SHARECAPITALANDWARRANTSIssuedandOutstandingWarrantsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-7300-8d9c-721f46f3e3ae" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-73a3-b8d2-543ae0885ba9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-7300-8d9c-721f46f3e3ae" xlink:to="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-73a3-b8d2-543ae0885ba9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9e9d-7157-9512-55691671fbdd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_01a03970-9e9d-73a3-b8d2-543ae0885ba9" xlink:to="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9e9d-7157-9512-55691671fbdd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-7157-9512-55691671fbdd_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9e9d-7157-9512-55691671fbdd" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-7157-9512-55691671fbdd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-78d4-a60b-34c5b04e5d8f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9e9d-7157-9512-55691671fbdd" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-78d4-a60b-34c5b04e5d8f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CommonShareWarrantsMember_01a03970-9e9d-749c-af06-42c06e10a49d" xlink:href="cve-20260930.xsd#cve_CommonShareWarrantsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9e9d-78d4-a60b-34c5b04e5d8f" xlink:to="loc_cve_CommonShareWarrantsMember_01a03970-9e9d-749c-af06-42c06e10a49d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7b0b-a94c-96b941a0e28b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesIssuedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-7300-8d9c-721f46f3e3ae" xlink:to="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7b0b-a94c-96b941a0e28b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_01a03970-9e9d-7497-9999-6da89fba8936" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7b0b-a94c-96b941a0e28b" xlink:to="loc_ifrs-full_NumberOfSharesOutstanding_01a03970-9e9d-7497-9999-6da89fba8936" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfCommonSharesIssuedUponExerciseOfWarrants_01a03970-9e9d-7602-a63a-51e939ed88fa" xlink:href="cve-20260930.xsd#cve_NumberOfCommonSharesIssuedUponExerciseOfWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7b0b-a94c-96b941a0e28b" xlink:to="loc_cve_NumberOfCommonSharesIssuedUponExerciseOfWarrants_01a03970-9e9d-7602-a63a-51e939ed88fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfCommonSharesIssuedUponExpiredOfWarrants_01a05c8e-e038-7182-a633-e2966078a4bc" xlink:href="cve-20260930.xsd#cve_NumberOfCommonSharesIssuedUponExpiredOfWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NumberOfSharesIssuedAbstract_01a03970-9e9d-7b0b-a94c-96b941a0e28b" xlink:to="loc_cve_NumberOfCommonSharesIssuedUponExpiredOfWarrants_01a05c8e-e038-7182-a633-e2966078a4bc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_01a03970-9e9d-72f5-bcc6-8534588d55d9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-715f-939b-fe428c58c41f" xlink:href="cve-20260930.xsd#cve_ValueOfSharesIssuedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_01a03970-9e9d-7300-8d9c-721f46f3e3ae" xlink:to="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-715f-939b-fe428c58c41f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital_01a03970-9e9d-7a76-832e-970061555114" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-715f-939b-fe428c58c41f" xlink:to="loc_ifrs-full_IssuedCapital_01a03970-9e9d-7a76-832e-970061555114" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CommonSharesIssuedInAmountUponExerciseOfWarrants_01a03970-9e9d-70ae-90bd-a439ce89e279" xlink:href="cve-20260930.xsd#cve_CommonSharesIssuedInAmountUponExerciseOfWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-715f-939b-fe428c58c41f" xlink:to="loc_cve_CommonSharesIssuedInAmountUponExerciseOfWarrants_01a03970-9e9d-70ae-90bd-a439ce89e279" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CommonSharesIssuedInAmountUponExpiredOfWarrants_01a05c8f-6e46-7364-9a2c-e87df8deb764" xlink:href="cve-20260930.xsd#cve_CommonSharesIssuedInAmountUponExpiredOfWarrants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_ValueOfSharesIssuedAbstract_01a03970-9e9d-715f-939b-fe428c58c41f" xlink:to="loc_cve_CommonSharesIssuedInAmountUponExpiredOfWarrants_01a05c8f-6e46-7364-9a2c-e87df8deb764" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapital_01a03970-9e9d-74e3-bad3-dd854f939af0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapital"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfAccumulatedOtherComprehensiveIncomeLossLineItems_01a03970-9e9d-7916-b422-47cdab724f65" xlink:href="cve-20260930.xsd#cve_DisclosureOfAccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfAccumulatedOtherComprehensiveIncomeLossTable_01a03970-9e9d-7397-9936-29427c9bac51" xlink:href="cve-20260930.xsd#cve_DisclosureOfAccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cve_DisclosureOfAccumulatedOtherComprehensiveIncomeLossLineItems_01a03970-9e9d-7916-b422-47cdab724f65" xlink:to="loc_cve_DisclosureOfAccumulatedOtherComprehensiveIncomeLossTable_01a03970-9e9d-7397-9936-29427c9bac51" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_01a03970-9e9d-7a13-9c09-e00a6ff0dc99" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfAccumulatedOtherComprehensiveIncomeLossTable_01a03970-9e9d-7397-9936-29427c9bac51" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_01a03970-9e9d-7a13-9c09-e00a6ff0dc99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9e9d-7a13-9c09-e00a6ff0dc99_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_01a03970-9e9d-7a13-9c09-e00a6ff0dc99" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9e9d-7a13-9c09-e00a6ff0dc99_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9e9d-7c63-b707-ba71e6c7171f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_01a03970-9e9d-7a13-9c09-e00a6ff0dc99" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9e9d-7c63-b707-ba71e6c7171f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DefinedBenefitPensionPlanMember_01a03970-9e9d-7ea3-9639-def7cab144d8" xlink:href="cve-20260930.xsd#cve_DefinedBenefitPensionPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9e9d-7c63-b707-ba71e6c7171f" xlink:to="loc_cve_DefinedBenefitPensionPlanMember_01a03970-9e9d-7ea3-9639-def7cab144d8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfGainsAndLossesFromInvestmentsInEquityInstrumentsMember_01a03970-9e9d-7b78-a531-29a19921d553" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfGainsAndLossesFromInvestmentsInEquityInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9e9d-7c63-b707-ba71e6c7171f" xlink:to="loc_ifrs-full_ReserveOfGainsAndLossesFromInvestmentsInEquityInstrumentsMember_01a03970-9e9d-7b78-a531-29a19921d553" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_01a03970-9e9d-7e63-813d-387c8fc2f24c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_01a03970-9e9d-7c63-b707-ba71e6c7171f" xlink:to="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_01a03970-9e9d-7e63-813d-387c8fc2f24c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedOtherComprehensiveIncome_01a03970-9e9d-7674-bacb-1d418c6f10a8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfAccumulatedOtherComprehensiveIncomeLossLineItems_01a03970-9e9d-7916-b422-47cdab724f65" xlink:to="loc_ifrs-full_AccumulatedOtherComprehensiveIncome_01a03970-9e9d-7674-bacb-1d418c6f10a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTax_01a03970-9e9d-7ffe-927a-6cea10002e2a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfAccumulatedOtherComprehensiveIncomeLossLineItems_01a03970-9e9d-7916-b422-47cdab724f65" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTax_01a03970-9e9d-7ffe-927a-6cea10002e2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ReclassificationsOnDivestituresRelatingToComponentsOfOtherComprehensiveIncome_01a03970-9e9d-7e2f-940f-0bb8def72e58" xlink:href="cve-20260930.xsd#cve_ReclassificationsOnDivestituresRelatingToComponentsOfOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfAccumulatedOtherComprehensiveIncomeLossLineItems_01a03970-9e9d-7916-b422-47cdab724f65" xlink:to="loc_cve_ReclassificationsOnDivestituresRelatingToComponentsOfOtherComprehensiveIncome_01a03970-9e9d-7e2f-940f-0bb8def72e58" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome_01a03970-9e9d-7fed-8942-9fa435b0c23c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfAccumulatedOtherComprehensiveIncomeLossLineItems_01a03970-9e9d-7916-b422-47cdab724f65" xlink:to="loc_ifrs-full_IncomeTaxRelatingToComponentsOfOtherComprehensiveIncome_01a03970-9e9d-7fed-8942-9fa435b0c23c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedOtherComprehensiveIncome_01a03970-9e9d-796d-8f56-44f39a6e6d87" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedOtherComprehensiveIncome"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/STOCKBASEDCOMPENSATIONPLANSInformationRelatedtoCenovussStockBasedCompensationPlansDetail" xlink:type="simple" xlink:href="cve-20260930.xsd#STOCKBASEDCOMPENSATIONPLANSInformationRelatedtoCenovussStockBasedCompensationPlansDetail"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/STOCKBASEDCOMPENSATIONPLANSInformationRelatedtoCenovussStockBasedCompensationPlansDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9d-7a96-8388-75c100f3da08" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_01a03970-9e9d-7185-8ca4-38d8c69d39f3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9d-7a96-8388-75c100f3da08" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_01a03970-9e9d-7185-8ca4-38d8c69d39f3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_01a03970-9e9d-7dd1-a07a-bf59ff94a761" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_01a03970-9e9d-7185-8ca4-38d8c69d39f3" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_01a03970-9e9d-7dd1-a07a-bf59ff94a761" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9d-7dd1-a07a-bf59ff94a761_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_01a03970-9e9d-7dd1-a07a-bf59ff94a761" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9d-7dd1-a07a-bf59ff94a761_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9d-7d25-93b7-8815eebcc80f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_01a03970-9e9d-7dd1-a07a-bf59ff94a761" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9d-7d25-93b7-8815eebcc80f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NetSettlementRightsMember_01a03970-9e9d-7ea7-8b2a-3a1560c16295" xlink:href="cve-20260930.xsd#cve_NetSettlementRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9d-7d25-93b7-8815eebcc80f" xlink:to="loc_cve_NetSettlementRightsMember_01a03970-9e9d-7ea7-8b2a-3a1560c16295" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_PerformanceShareUnitsMember_01a03970-9e9d-74c5-9849-ea7f5d2dceec" xlink:href="cve-20260930.xsd#cve_PerformanceShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9d-7d25-93b7-8815eebcc80f" xlink:to="loc_cve_PerformanceShareUnitsMember_01a03970-9e9d-74c5-9849-ea7f5d2dceec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RestrictedShareUnitsMember_01a03970-9e9d-794a-aedd-9d5c192fc588" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestrictedShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9d-7d25-93b7-8815eebcc80f" xlink:to="loc_ifrs-full_RestrictedShareUnitsMember_01a03970-9e9d-794a-aedd-9d5c192fc588" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DeferredShareUnitsMember_01a03970-9e9d-7f6b-b186-abc9f7a8b72c" xlink:href="cve-20260930.xsd#cve_DeferredShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9d-7d25-93b7-8815eebcc80f" xlink:to="loc_cve_DeferredShareUnitsMember_01a03970-9e9d-7f6b-b186-abc9f7a8b72c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOutstandingShareOptions_01a03970-9e9d-71c5-a3b3-18e1cb5d7c74" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOutstandingShareOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9d-7a96-8388-75c100f3da08" xlink:to="loc_ifrs-full_NumberOfOutstandingShareOptions_01a03970-9e9d-71c5-a3b3-18e1cb5d7c74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_01a03970-9e9d-7429-8d63-d4f9af6a0364" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9d-7a96-8388-75c100f3da08" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement_01a03970-9e9d-7429-8d63-d4f9af6a0364" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_01a03970-9e9d-709c-9159-fd4195e00b52" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9d-7a96-8388-75c100f3da08" xlink:to="loc_ifrs-full_NumberOfShareOptionsExercisableInSharebasedPaymentArrangement_01a03970-9e9d-709c-9159-fd4195e00b52" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisableInSharebasedPaymentArrangement_01a03970-9e9d-78a7-959f-a67d84edd322" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsExercisableInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9d-7a96-8388-75c100f3da08" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisableInSharebasedPaymentArrangement_01a03970-9e9d-78a7-959f-a67d84edd322" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement_01a03970-9e9d-7b68-a6f3-ba6a0eae4916" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9d-7a96-8388-75c100f3da08" xlink:to="loc_ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement_01a03970-9e9d-7b68-a6f3-ba6a0eae4916" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_01a03970-9e9d-7a7a-87f0-f04379fcb5e8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9d-7a96-8388-75c100f3da08" xlink:to="loc_ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted_01a03970-9e9d-7a7a-87f0-f04379fcb5e8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_01a03970-9e9d-794c-8719-b638dafbc32c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9d-7a96-8388-75c100f3da08" xlink:to="loc_ifrs-full_NumberOfShareOptionsExercisedInSharebasedPaymentArrangement_01a03970-9e9d-794c-8719-b638dafbc32c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_01a03970-9e9d-7505-a3ce-bbf661af4c1c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9d-7a96-8388-75c100f3da08" xlink:to="loc_ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement_01a03970-9e9d-7505-a3ce-bbf661af4c1c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement2019_01a03970-9e9d-7af8-860a-cf88e899e82c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9d-7a96-8388-75c100f3da08" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement2019_01a03970-9e9d-7af8-860a-cf88e899e82c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInShareBasedPaymentArrangementSettledForCommonShares_01a03970-9e9d-7a22-833f-63e1482f00fb" xlink:href="cve-20260930.xsd#cve_WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInShareBasedPaymentArrangementSettledForCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9d-7a96-8388-75c100f3da08" xlink:to="loc_cve_WeightedAverageExercisePriceOfOtherEquityInstrumentsExercisedOrVestedInShareBasedPaymentArrangementSettledForCommonShares_01a03970-9e9d-7a22-833f-63e1482f00fb" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfOtherEquityInstrumentsExercisedOrVestedInShareBasedPaymentArrangementSettledForCommonShares_01a03970-9e9d-7c42-8966-eba2d9c61a06" xlink:href="cve-20260930.xsd#cve_NumberOfOtherEquityInstrumentsExercisedOrVestedInShareBasedPaymentArrangementSettledForCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9d-7a96-8388-75c100f3da08" xlink:to="loc_cve_NumberOfOtherEquityInstrumentsExercisedOrVestedInShareBasedPaymentArrangementSettledForCommonShares_01a03970-9e9d-7c42-8966-eba2d9c61a06" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/STOCKBASEDCOMPENSATIONPLANSAdditionalInformationDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#STOCKBASEDCOMPENSATIONPLANSAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/STOCKBASEDCOMPENSATIONPLANSAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9e-7b4d-87fe-e917d3d0cf84" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_01a03970-9e9d-7af3-ab46-3d3724c3f453" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9e-7b4d-87fe-e917d3d0cf84" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_01a03970-9e9d-7af3-ab46-3d3724c3f453" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_01a03970-9e9d-7f30-8c75-3dfb14dcfbcb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_01a03970-9e9d-7af3-ab46-3d3724c3f453" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_01a03970-9e9d-7f30-8c75-3dfb14dcfbcb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9d-7f30-8c75-3dfb14dcfbcb_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_01a03970-9e9d-7f30-8c75-3dfb14dcfbcb" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9d-7f30-8c75-3dfb14dcfbcb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9d-7170-b48f-76c1e722ece9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_01a03970-9e9d-7f30-8c75-3dfb14dcfbcb" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9d-7170-b48f-76c1e722ece9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NetSettlementRightsMember_01a03970-9e9e-783e-abfe-4970872a27f0" xlink:href="cve-20260930.xsd#cve_NetSettlementRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9d-7170-b48f-76c1e722ece9" xlink:to="loc_cve_NetSettlementRightsMember_01a03970-9e9e-783e-abfe-4970872a27f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019_01a03970-9e9e-7e3f-8eb5-34f707da5149" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9e-7b4d-87fe-e917d3d0cf84" xlink:to="loc_ifrs-full_WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement2019_01a03970-9e9e-7e3f-8eb5-34f707da5149" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CommonSharesIssuedInExerciseOfOtherEquityInstruments_01a03970-9e9e-7252-8785-99234eb821bd" xlink:href="cve-20260930.xsd#cve_CommonSharesIssuedInExerciseOfOtherEquityInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9e-7b4d-87fe-e917d3d0cf84" xlink:to="loc_cve_CommonSharesIssuedInExerciseOfOtherEquityInstruments_01a03970-9e9e-7252-8785-99234eb821bd" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/STOCKBASEDCOMPENSATIONPLANSStockBasedCompensationDetail" xlink:type="simple" xlink:href="cve-20260930.xsd#STOCKBASEDCOMPENSATIONPLANSStockBasedCompensationDetail"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/STOCKBASEDCOMPENSATIONPLANSStockBasedCompensationDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9e-7283-8e22-d020f3614003" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_01a03970-9e9e-789e-b7b5-fc65da7442ef" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9e-7283-8e22-d020f3614003" xlink:to="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_01a03970-9e9e-789e-b7b5-fc65da7442ef" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_01a03970-9e9e-7d34-8f11-d3057f596df4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable_01a03970-9e9e-789e-b7b5-fc65da7442ef" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_01a03970-9e9e-7d34-8f11-d3057f596df4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9e-7d34-8f11-d3057f596df4_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_01a03970-9e9e-7d34-8f11-d3057f596df4" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9e-7d34-8f11-d3057f596df4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9e-7ceb-9be8-232b7c3e3873" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfSharebasedPaymentArrangementsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsAxis_01a03970-9e9e-7d34-8f11-d3057f596df4" xlink:to="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9e-7ceb-9be8-232b7c3e3873" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NetSettlementRightsMember_01a03970-9e9e-7177-b4a6-db42dfd7d1a9" xlink:href="cve-20260930.xsd#cve_NetSettlementRightsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9e-7ceb-9be8-232b7c3e3873" xlink:to="loc_cve_NetSettlementRightsMember_01a03970-9e9e-7177-b4a6-db42dfd7d1a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CenovusReplacementStockOptionsMember_01a03970-9e9e-7fb1-bb86-e6f0a94768dd" xlink:href="cve-20260930.xsd#cve_CenovusReplacementStockOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9e-7ceb-9be8-232b7c3e3873" xlink:to="loc_cve_CenovusReplacementStockOptionsMember_01a03970-9e9e-7fb1-bb86-e6f0a94768dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_PerformanceShareUnitsMember_01a03970-9e9e-7922-ae0e-429f99415bc8" xlink:href="cve-20260930.xsd#cve_PerformanceShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9e-7ceb-9be8-232b7c3e3873" xlink:to="loc_cve_PerformanceShareUnitsMember_01a03970-9e9e-7922-ae0e-429f99415bc8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RestrictedShareUnitsMember_01a03970-9e9e-7380-8627-e7bd71f28d77" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestrictedShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9e-7ceb-9be8-232b7c3e3873" xlink:to="loc_ifrs-full_RestrictedShareUnitsMember_01a03970-9e9e-7380-8627-e7bd71f28d77" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DeferredShareUnitsMember_01a03970-9e9e-7829-ae2d-8f6455f3168a" xlink:href="cve-20260930.xsd#cve_DeferredShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfSharebasedPaymentArrangementsDomain_01a03970-9e9e-7ceb-9be8-232b7c3e3873" xlink:to="loc_cve_DeferredShareUnitsMember_01a03970-9e9e-7829-ae2d-8f6455f3168a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees_01a03970-9e9e-70ad-944c-4f0f1b07266b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems_01a03970-9e9e-7283-8e22-d020f3614003" xlink:to="loc_ifrs-full_ExpenseFromSharebasedPaymentTransactionsWithEmployees_01a03970-9e9e-70ad-944c-4f0f1b07266b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/RELATEDPARTYTRANSACTIONSDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#RELATEDPARTYTRANSACTIONSDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/RELATEDPARTYTRANSACTIONSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_01a03970-9e9e-7e82-b8c5-d868b841328d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_01a03970-9e9e-70cf-9f71-f009b77f03a8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_01a03970-9e9e-7e82-b8c5-d868b841328d" xlink:to="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_01a03970-9e9e-70cf-9f71-f009b77f03a8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointVenturesAxis_01a03970-9e9e-7fdd-839f-ee4329e6ec3c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointVenturesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_01a03970-9e9e-70cf-9f71-f009b77f03a8" xlink:to="loc_ifrs-full_JointVenturesAxis_01a03970-9e9e-7fdd-839f-ee4329e6ec3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointVenturesDomain_01a03970-9e9e-7fdd-839f-ee4329e6ec3c_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_JointVenturesAxis_01a03970-9e9e-7fdd-839f-ee4329e6ec3c" xlink:to="loc_ifrs-full_JointVenturesDomain_01a03970-9e9e-7fdd-839f-ee4329e6ec3c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointVenturesDomain_01a03970-9e9e-740a-84a2-9d6a19e7db99" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_JointVenturesAxis_01a03970-9e9e-7fdd-839f-ee4329e6ec3c" xlink:to="loc_ifrs-full_JointVenturesDomain_01a03970-9e9e-740a-84a2-9d6a19e7db99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_HuskyMidstreamLimitedPartnershipMember_01a03970-9e9e-73c4-b289-d5d1f4bacdf4" xlink:href="cve-20260930.xsd#cve_HuskyMidstreamLimitedPartnershipMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_JointVenturesDomain_01a03970-9e9e-740a-84a2-9d6a19e7db99" xlink:to="loc_cve_HuskyMidstreamLimitedPartnershipMember_01a03970-9e9e-73c4-b289-d5d1f4bacdf4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_01a03970-9e9e-7925-aa9a-2cf718b52640" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_01a03970-9e9e-70cf-9f71-f009b77f03a8" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_01a03970-9e9e-7925-aa9a-2cf718b52640" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_01a03970-9e9e-7925-aa9a-2cf718b52640_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_01a03970-9e9e-7925-aa9a-2cf718b52640" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_01a03970-9e9e-7925-aa9a-2cf718b52640_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_01a03970-9e9e-7b9c-8cf3-9cdfc590423a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_01a03970-9e9e-7925-aa9a-2cf718b52640" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_01a03970-9e9e-7b9c-8cf3-9cdfc590423a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_JointVenturesWhereEntityIsVenturerMember_01a03970-9e9e-7bf3-8c0a-4865ff6f079b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_JointVenturesWhereEntityIsVenturerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_01a03970-9e9e-7b9c-8cf3-9cdfc590423a" xlink:to="loc_ifrs-full_JointVenturesWhereEntityIsVenturerMember_01a03970-9e9e-7bf3-8c0a-4865ff6f079b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueFromRenderingOfServicesRelatedPartyTransactions_01a03970-9e9e-7e76-ae94-80eb6f1c5973" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueFromRenderingOfServicesRelatedPartyTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_01a03970-9e9e-7e82-b8c5-d868b841328d" xlink:to="loc_ifrs-full_RevenueFromRenderingOfServicesRelatedPartyTransactions_01a03970-9e9e-7e76-ae94-80eb6f1c5973" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchasesOfGoodsRelatedPartyTransactions_01a03970-9e9e-7fca-b0d6-40d27ac99d34" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchasesOfGoodsRelatedPartyTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_01a03970-9e9e-7e82-b8c5-d868b841328d" xlink:to="loc_ifrs-full_PurchasesOfGoodsRelatedPartyTransactions_01a03970-9e9e-7fca-b0d6-40d27ac99d34" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/FINANCIALINSTRUMENTSAdditionalInformationDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#FINANCIALINSTRUMENTSAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/FINANCIALINSTRUMENTSAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_01a03970-9e9e-7f12-b9e5-6cb717199543" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_01a03970-9e9e-7eca-9c8e-e97e07f3dd6a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_01a03970-9e9e-7f12-b9e5-6cb717199543" xlink:to="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_01a03970-9e9e-7eca-9c8e-e97e07f3dd6a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-792a-a714-956f6719fa95" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_01a03970-9e9e-7eca-9c8e-e97e07f3dd6a" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-792a-a714-956f6719fa95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-792a-a714-956f6719fa95_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-792a-a714-956f6719fa95" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-792a-a714-956f6719fa95_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-778e-a642-b945463e3bd4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-792a-a714-956f6719fa95" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-778e-a642-b945463e3bd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level2OfFairValueHierarchyMember_01a03970-9e9e-7cec-bdad-5be83ba61e83" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level2OfFairValueHierarchyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-778e-a642-b945463e3bd4" xlink:to="loc_ifrs-full_Level2OfFairValueHierarchyMember_01a03970-9e9e-7cec-bdad-5be83ba61e83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_01a03970-9e9e-76b8-8126-013b41bf40a3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_01a03970-9e9e-7f12-b9e5-6cb717199543" xlink:to="loc_ifrs-full_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings_01a03970-9e9e-76b8-8126-013b41bf40a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_FairValueDebtCarriedAtAmortizedCost_01a03970-9e9e-7259-a4a4-de9f8df862aa" xlink:href="cve-20260930.xsd#cve_FairValueDebtCarriedAtAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_01a03970-9e9e-7f12-b9e5-6cb717199543" xlink:to="loc_cve_FairValueDebtCarriedAtAmortizedCost_01a03970-9e9e-7259-a4a4-de9f8df862aa" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/FINANCIALINSTRUMENTSReconciliationofChangesintheFairValueofAvailableforSaleFinancialAssetsDetail" xlink:type="simple" xlink:href="cve-20260930.xsd#FINANCIALINSTRUMENTSReconciliationofChangesintheFairValueofAvailableforSaleFinancialAssetsDetail"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/FINANCIALINSTRUMENTSReconciliationofChangesintheFairValueofAvailableforSaleFinancialAssetsDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_01a03970-9e9e-7a05-892a-d3d754879bab" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_01a03970-9e9e-7830-b410-00c236b3c916" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_01a03970-9e9e-7a05-892a-d3d754879bab" xlink:to="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_01a03970-9e9e-7830-b410-00c236b3c916" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-7b53-8632-991c7473de32" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsTable_01a03970-9e9e-7830-b410-00c236b3c916" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-7b53-8632-991c7473de32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-7b53-8632-991c7473de32_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-7b53-8632-991c7473de32" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-7b53-8632-991c7473de32_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-7620-a1b4-18b43a07f91c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-7b53-8632-991c7473de32" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-7620-a1b4-18b43a07f91c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level3OfFairValueHierarchyMember_01a03970-9e9e-7827-982e-bcb893ceead7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level3OfFairValueHierarchyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-7620-a1b4-18b43a07f91c" xlink:to="loc_ifrs-full_Level3OfFairValueHierarchyMember_01a03970-9e9e-7827-982e-bcb893ceead7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValue_01a03970-9e9e-72ab-a1d3-be5e2658978b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_01a03970-9e9e-7a05-892a-d3d754879bab" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValue_01a03970-9e9e-72ab-a1d3-be5e2658978b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchasesFairValueMeasurementAssets_01a03970-9e9e-739b-9b79-02659e0af09c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchasesFairValueMeasurementAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_01a03970-9e9e-7a05-892a-d3d754879bab" xlink:to="loc_ifrs-full_PurchasesFairValueMeasurementAssets_01a03970-9e9e-739b-9b79-02659e0af09c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInFairValueMeasurementAssets_01a03970-9e9e-78dd-b7b3-dce0fea77904" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseInFairValueMeasurementAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFairValueMeasurementOfAssetsLineItems_01a03970-9e9e-7a05-892a-d3d754879bab" xlink:to="loc_ifrs-full_IncreaseDecreaseInFairValueMeasurementAssets_01a03970-9e9e-78dd-b7b3-dce0fea77904" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValue_01a03970-9e9e-7d6f-bbe8-e6c58a9a9086" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/FINANCIALINSTRUMENTSUnrealizedRiskManagementPositionsDetail" xlink:type="simple" xlink:href="cve-20260930.xsd#FINANCIALINSTRUMENTSUnrealizedRiskManagementPositionsDetail"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/FINANCIALINSTRUMENTSUnrealizedRiskManagementPositionsDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfRecurringFairValueMeasurementOfAssetsAndLiabilitiesLineItems_01a03970-9e9e-7ace-aff6-d6a14182aa6f" xlink:href="cve-20260930.xsd#cve_DisclosureOfRecurringFairValueMeasurementOfAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfRecurringFairValueMeasurementOfAssetsAndLiabilitiesTable_01a03970-9e9e-74bd-b2fb-f68d17977769" xlink:href="cve-20260930.xsd#cve_DisclosureOfRecurringFairValueMeasurementOfAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cve_DisclosureOfRecurringFairValueMeasurementOfAssetsAndLiabilitiesLineItems_01a03970-9e9e-7ace-aff6-d6a14182aa6f" xlink:to="loc_cve_DisclosureOfRecurringFairValueMeasurementOfAssetsAndLiabilitiesTable_01a03970-9e9e-74bd-b2fb-f68d17977769" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-7dc6-8ea0-206bc1c72614" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfRecurringFairValueMeasurementOfAssetsAndLiabilitiesTable_01a03970-9e9e-74bd-b2fb-f68d17977769" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-7dc6-8ea0-206bc1c72614" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-7dc6-8ea0-206bc1c72614_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-7dc6-8ea0-206bc1c72614" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-7dc6-8ea0-206bc1c72614_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-7506-9938-d056d89d550e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-7dc6-8ea0-206bc1c72614" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-7506-9938-d056d89d550e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level2OfFairValueHierarchyMember_01a03970-9e9e-729f-95b6-ed0df99cc73b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level2OfFairValueHierarchyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-7506-9938-d056d89d550e" xlink:to="loc_ifrs-full_Level2OfFairValueHierarchyMember_01a03970-9e9e-729f-95b6-ed0df99cc73b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis_01a03970-9e9e-709f-8679-4c4331a2a27d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfRecurringFairValueMeasurementOfAssetsAndLiabilitiesTable_01a03970-9e9e-74bd-b2fb-f68d17977769" xlink:to="loc_ifrs-full_TypesOfRisksAxis_01a03970-9e9e-709f-8679-4c4331a2a27d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-709f-8679-4c4331a2a27d_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_01a03970-9e9e-709f-8679-4c4331a2a27d" xlink:to="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-709f-8679-4c4331a2a27d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-7943-9f28-779f739fbd85" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_01a03970-9e9e-709f-8679-4c4331a2a27d" xlink:to="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-7943-9f28-779f739fbd85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CommodityPriceRiskMember_01a03970-9e9e-7b71-ba6c-0004da801f6b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CommodityPriceRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-7943-9f28-779f739fbd85" xlink:to="loc_ifrs-full_CommodityPriceRiskMember_01a03970-9e9e-7b71-ba6c-0004da801f6b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrencyRiskMember_01a03970-9e9e-7add-b320-c2494385bd28" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrencyRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-7943-9f28-779f739fbd85" xlink:to="loc_ifrs-full_CurrencyRiskMember_01a03970-9e9e-7add-b320-c2494385bd28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-74d3-a5c1-71a645f19d09" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfRecurringFairValueMeasurementOfAssetsAndLiabilitiesTable_01a03970-9e9e-74bd-b2fb-f68d17977769" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-74d3-a5c1-71a645f19d09" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-74d3-a5c1-71a645f19d09_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-74d3-a5c1-71a645f19d09" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-74d3-a5c1-71a645f19d09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7d05-9004-6a3433385945" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-74d3-a5c1-71a645f19d09" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7d05-9004-6a3433385945" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CrudeOilNaturalGasCondensationAndRefinedProductsMember_01a03970-9e9e-7261-a210-a16f27ec30a4" xlink:href="cve-20260930.xsd#cve_CrudeOilNaturalGasCondensationAndRefinedProductsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7d05-9004-6a3433385945" xlink:to="loc_cve_CrudeOilNaturalGasCondensationAndRefinedProductsMember_01a03970-9e9e-7261-a210-a16f27ec30a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_PowerSwapContractsMember_01a03970-9e9e-7a41-81ee-fc66806f2ca6" xlink:href="cve-20260930.xsd#cve_PowerSwapContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7d05-9004-6a3433385945" xlink:to="loc_cve_PowerSwapContractsMember_01a03970-9e9e-7a41-81ee-fc66806f2ca6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RenewableEnergyContractsMember_01a03970-9e9e-75ba-a3e3-d739c61425f8" xlink:href="cve-20260930.xsd#cve_RenewableEnergyContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7d05-9004-6a3433385945" xlink:to="loc_cve_RenewableEnergyContractsMember_01a03970-9e9e-75ba-a3e3-d739c61425f8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ExchangeRateContractsMember_01a03970-9e9e-7158-a790-b4948552398a" xlink:href="cve-20260930.xsd#cve_ExchangeRateContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7d05-9004-6a3433385945" xlink:to="loc_cve_ExchangeRateContractsMember_01a03970-9e9e-7158-a790-b4948552398a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValue_01a03970-9e9e-756e-9ae7-ffb62825f8ac" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfRecurringFairValueMeasurementOfAssetsAndLiabilitiesLineItems_01a03970-9e9e-7ace-aff6-d6a14182aa6f" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValue_01a03970-9e9e-756e-9ae7-ffb62825f8ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValue_01a03970-9e9e-70fc-aac6-5a7a9a86d992" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfRecurringFairValueMeasurementOfAssetsAndLiabilitiesLineItems_01a03970-9e9e-7ace-aff6-d6a14182aa6f" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValue_01a03970-9e9e-70fc-aac6-5a7a9a86d992" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_FairValueOfDerivativeFinancialInstrumentsNet_01a03970-9e9e-7465-bcb5-29fe6a16de85" xlink:href="cve-20260930.xsd#cve_FairValueOfDerivativeFinancialInstrumentsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfRecurringFairValueMeasurementOfAssetsAndLiabilitiesLineItems_01a03970-9e9e-7ace-aff6-d6a14182aa6f" xlink:to="loc_cve_FairValueOfDerivativeFinancialInstrumentsNet_01a03970-9e9e-7465-bcb5-29fe6a16de85" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/FINANCIALINSTRUMENTSFairValueHierarchyforRiskManagementAssetsandLiabilitiesCarriedatFairValueDetail" xlink:type="simple" xlink:href="cve-20260930.xsd#FINANCIALINSTRUMENTSFairValueHierarchyforRiskManagementAssetsandLiabilitiesCarriedatFairValueDetail"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/FINANCIALINSTRUMENTSFairValueHierarchyforRiskManagementAssetsandLiabilitiesCarriedatFairValueDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfLevelsOfFairValueHierarchyLineItems_01a03970-9e9e-79d3-881d-587a6da3ff1a" xlink:href="cve-20260930.xsd#cve_DisclosureOfLevelsOfFairValueHierarchyLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfLevelsOfFairValueHierarchyTable_01a03970-9e9e-7d51-886f-252fe29bbf65" xlink:href="cve-20260930.xsd#cve_DisclosureOfLevelsOfFairValueHierarchyTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cve_DisclosureOfLevelsOfFairValueHierarchyLineItems_01a03970-9e9e-79d3-881d-587a6da3ff1a" xlink:to="loc_cve_DisclosureOfLevelsOfFairValueHierarchyTable_01a03970-9e9e-7d51-886f-252fe29bbf65" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-79ee-8359-ff187072b293" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfLevelsOfFairValueHierarchyTable_01a03970-9e9e-7d51-886f-252fe29bbf65" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-79ee-8359-ff187072b293" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-79ee-8359-ff187072b293_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-79ee-8359-ff187072b293" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-79ee-8359-ff187072b293_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-72d2-b5be-f10d8189ac13" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_01a03970-9e9e-79ee-8359-ff187072b293" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-72d2-b5be-f10d8189ac13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level2OfFairValueHierarchyMember_01a03970-9e9e-77b1-9712-80acb9ce3213" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level2OfFairValueHierarchyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-72d2-b5be-f10d8189ac13" xlink:to="loc_ifrs-full_Level2OfFairValueHierarchyMember_01a03970-9e9e-77b1-9712-80acb9ce3213" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level3OfFairValueHierarchyMember_01a03970-9e9e-734c-a205-c7009a46d6cb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level3OfFairValueHierarchyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_01a03970-9e9e-72d2-b5be-f10d8189ac13" xlink:to="loc_ifrs-full_Level3OfFairValueHierarchyMember_01a03970-9e9e-734c-a205-c7009a46d6cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_FairValueOfDerivativeFinancialInstruments_01a03970-9e9e-7838-aaeb-909572521819" xlink:href="cve-20260930.xsd#cve_FairValueOfDerivativeFinancialInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfLevelsOfFairValueHierarchyLineItems_01a03970-9e9e-79d3-881d-587a6da3ff1a" xlink:to="loc_cve_FairValueOfDerivativeFinancialInstruments_01a03970-9e9e-7838-aaeb-909572521819" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_FairValueOfDerivativeFinancialInstrumentsNet_01a03970-9e9e-7ea3-8f06-cae6a74f5cb3" xlink:href="cve-20260930.xsd#cve_FairValueOfDerivativeFinancialInstrumentsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfLevelsOfFairValueHierarchyLineItems_01a03970-9e9e-79d3-881d-587a6da3ff1a" xlink:to="loc_cve_FairValueOfDerivativeFinancialInstrumentsNet_01a03970-9e9e-7ea3-8f06-cae6a74f5cb3" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/FINANCIALINSTRUMENTSEarningsImpactofGainLossfromRiskManagementPositionsDetail" xlink:type="simple" xlink:href="cve-20260930.xsd#FINANCIALINSTRUMENTSEarningsImpactofGainLossfromRiskManagementPositionsDetail"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/FINANCIALINSTRUMENTSEarningsImpactofGainLossfromRiskManagementPositionsDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_01a03970-9e9e-7a2a-9243-fcf3c662241b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_01a03970-9e9e-79bf-84f8-ab17ec99c5b9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialInstrumentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_01a03970-9e9e-7a2a-9243-fcf3c662241b" xlink:to="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_01a03970-9e9e-79bf-84f8-ab17ec99c5b9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskAxis_01a03970-9e9e-7e3e-96fd-89d39775c5f9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsTable_01a03970-9e9e-79bf-84f8-ab17ec99c5b9" xlink:to="loc_ifrs-full_FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskAxis_01a03970-9e9e-7e3e-96fd-89d39775c5f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskDomain_01a03970-9e9e-7e3e-96fd-89d39775c5f9_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskAxis_01a03970-9e9e-7e3e-96fd-89d39775c5f9" xlink:to="loc_ifrs-full_FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskDomain_01a03970-9e9e-7e3e-96fd-89d39775c5f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskDomain_01a03970-9e9e-77df-81bb-8a97013e852f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskAxis_01a03970-9e9e-7e3e-96fd-89d39775c5f9" xlink:to="loc_ifrs-full_FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskDomain_01a03970-9e9e-77df-81bb-8a97013e852f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RealisedGainLossMember_01a03970-9e9e-799f-a6c9-19aa5cd375c5" xlink:href="cve-20260930.xsd#cve_RealisedGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskDomain_01a03970-9e9e-77df-81bb-8a97013e852f" xlink:to="loc_cve_RealisedGainLossMember_01a03970-9e9e-799f-a6c9-19aa5cd375c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_UnrealisedGainLossMember_01a03970-9e9e-7c8e-98f8-92321196954a" xlink:href="cve-20260930.xsd#cve_UnrealisedGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_FinancialInstrumentsMeasuredAtFairValueThroughProfitOrLossBecauseCreditDerivativeIsUsedToManageCreditRiskDomain_01a03970-9e9e-77df-81bb-8a97013e852f" xlink:to="loc_cve_UnrealisedGainLossMember_01a03970-9e9e-7c8e-98f8-92321196954a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnChangeInFairValueOfDerivatives_01a03970-9e9e-7ed8-8d10-07f88d5c8dfe" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesOnChangeInFairValueOfDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialInstrumentsLineItems_01a03970-9e9e-7a2a-9243-fcf3c662241b" xlink:to="loc_ifrs-full_GainsLossesOnChangeInFairValueOfDerivatives_01a03970-9e9e-7ed8-8d10-07f88d5c8dfe" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/RISKMANAGEMENTAdditionalInformationDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#RISKMANAGEMENTAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/RISKMANAGEMENTAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7b7d-9ad9-f2868477b9ab" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable_01a03970-9e9e-778f-88a4-53ba5327a227" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7b7d-9ad9-f2868477b9ab" xlink:to="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable_01a03970-9e9e-778f-88a4-53ba5327a227" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-7017-b6c7-ddacd4c54aa0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable_01a03970-9e9e-778f-88a4-53ba5327a227" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-7017-b6c7-ddacd4c54aa0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7017-b6c7-ddacd4c54aa0_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-7017-b6c7-ddacd4c54aa0" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7017-b6c7-ddacd4c54aa0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7aa8-814a-37c6494a9ad4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-7017-b6c7-ddacd4c54aa0" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7aa8-814a-37c6494a9ad4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ForeignExchangeContractsMember_01a03970-9e9e-7f83-928a-efdde81732f0" xlink:href="cve-20260930.xsd#cve_ForeignExchangeContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7aa8-814a-37c6494a9ad4" xlink:to="loc_cve_ForeignExchangeContractsMember_01a03970-9e9e-7f83-928a-efdde81732f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_InterestRateContractsOrCrossCurrencyInterestRateSwapsMember_01a07b52-c16b-7d5d-8947-837b2fd1d84a" xlink:href="cve-20260930.xsd#cve_InterestRateContractsOrCrossCurrencyInterestRateSwapsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7aa8-814a-37c6494a9ad4" xlink:to="loc_cve_InterestRateContractsOrCrossCurrencyInterestRateSwapsMember_01a07b52-c16b-7d5d-8947-837b2fd1d84a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeReceivablesMember_01a03970-9e9e-74e0-8a87-57f4d3e9bb4b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7aa8-814a-37c6494a9ad4" xlink:to="loc_ifrs-full_TradeReceivablesMember_01a03970-9e9e-74e0-8a87-57f4d3e9bb4b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TypesOfFinancialInstrumentsAxis_01a03970-9e9e-7b7b-b934-60c4fb433d7a" xlink:href="cve-20260930.xsd#cve_TypesOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable_01a03970-9e9e-778f-88a4-53ba5327a227" xlink:to="loc_cve_TypesOfFinancialInstrumentsAxis_01a03970-9e9e-7b7b-b934-60c4fb433d7a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TypesOfFinancialInstrumentsDomain_01a03970-9e9e-7b7b-b934-60c4fb433d7a_default" xlink:href="cve-20260930.xsd#cve_TypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cve_TypesOfFinancialInstrumentsAxis_01a03970-9e9e-7b7b-b934-60c4fb433d7a" xlink:to="loc_cve_TypesOfFinancialInstrumentsDomain_01a03970-9e9e-7b7b-b934-60c4fb433d7a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TypesOfFinancialInstrumentsDomain_01a03970-9e9e-72fa-8253-72bbf058f4f6" xlink:href="cve-20260930.xsd#cve_TypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cve_TypesOfFinancialInstrumentsAxis_01a03970-9e9e-7b7b-b934-60c4fb433d7a" xlink:to="loc_cve_TypesOfFinancialInstrumentsDomain_01a03970-9e9e-72fa-8253-72bbf058f4f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_FairValueDerivativeFinancialInstrumentsMember_01a03970-9e9e-75da-97ae-120683654184" xlink:href="cve-20260930.xsd#cve_FairValueDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_TypesOfFinancialInstrumentsDomain_01a03970-9e9e-72fa-8253-72bbf058f4f6" xlink:to="loc_cve_FairValueDerivativeFinancialInstrumentsMember_01a03970-9e9e-75da-97ae-120683654184" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis_01a03970-9e9e-7737-80eb-0f92553d90ee" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable_01a03970-9e9e-778f-88a4-53ba5327a227" xlink:to="loc_ifrs-full_TypesOfRisksAxis_01a03970-9e9e-7737-80eb-0f92553d90ee" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-7737-80eb-0f92553d90ee_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_01a03970-9e9e-7737-80eb-0f92553d90ee" xlink:to="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-7737-80eb-0f92553d90ee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-7d9c-9607-2bee990f3305" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_01a03970-9e9e-7737-80eb-0f92553d90ee" xlink:to="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-7d9c-9607-2bee990f3305" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditRiskMember_01a03970-9e9e-7d35-aa81-6951a6aa0277" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-7d9c-9607-2bee990f3305" xlink:to="loc_ifrs-full_CreditRiskMember_01a03970-9e9e-7d35-aa81-6951a6aa0277" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExternalCreditGradesAxis_01a03970-9e9e-7388-91ce-265ffd079615" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExternalCreditGradesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable_01a03970-9e9e-778f-88a4-53ba5327a227" xlink:to="loc_ifrs-full_ExternalCreditGradesAxis_01a03970-9e9e-7388-91ce-265ffd079615" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExternalCreditGradesDomain_01a03970-9e9e-7388-91ce-265ffd079615_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExternalCreditGradesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ExternalCreditGradesAxis_01a03970-9e9e-7388-91ce-265ffd079615" xlink:to="loc_ifrs-full_ExternalCreditGradesDomain_01a03970-9e9e-7388-91ce-265ffd079615_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExternalCreditGradesDomain_01a03970-9e9e-7201-8e39-bcd2c282876d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExternalCreditGradesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ExternalCreditGradesAxis_01a03970-9e9e-7388-91ce-265ffd079615" xlink:to="loc_ifrs-full_ExternalCreditGradesDomain_01a03970-9e9e-7201-8e39-bcd2c282876d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_InvestmentGradeCounterpartiesMember_01a03970-9e9e-7ee7-a46a-76fdf2b785df" xlink:href="cve-20260930.xsd#cve_InvestmentGradeCounterpartiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ExternalCreditGradesDomain_01a03970-9e9e-7201-8e39-bcd2c282876d" xlink:to="loc_cve_InvestmentGradeCounterpartiesMember_01a03970-9e9e-7ee7-a46a-76fdf2b785df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeAxis_01a03970-9e9e-75ef-8931-45b1e66d8b87" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfRiskManagementStrategyRelatedToHedgeAccountingTable_01a03970-9e9e-778f-88a4-53ba5327a227" xlink:to="loc_ifrs-full_RangeAxis_01a03970-9e9e-75ef-8931-45b1e66d8b87" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_01a03970-9e9e-75ef-8931-45b1e66d8b87_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_01a03970-9e9e-75ef-8931-45b1e66d8b87" xlink:to="loc_ifrs-full_RangeDomain_01a03970-9e9e-75ef-8931-45b1e66d8b87_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_01a03970-9e9e-70f3-8d7f-dd2461046bc8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_01a03970-9e9e-75ef-8931-45b1e66d8b87" xlink:to="loc_ifrs-full_RangeDomain_01a03970-9e9e-70f3-8d7f-dd2461046bc8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BottomOfRangeMember_01a03970-9e9e-7b5d-a4e1-f3fd06a48953" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_01a03970-9e9e-70f3-8d7f-dd2461046bc8" xlink:to="loc_ifrs-full_BottomOfRangeMember_01a03970-9e9e-7b5d-a4e1-f3fd06a48953" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_FairValueOfDerivativeFinancialInstrumentsNet_01a03970-9e9e-7ae4-8c5c-384963e04993" xlink:href="cve-20260930.xsd#cve_FairValueOfDerivativeFinancialInstrumentsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7b7d-9ad9-f2868477b9ab" xlink:to="loc_cve_FairValueOfDerivativeFinancialInstrumentsNet_01a03970-9e9e-7ae4-8c5c-384963e04993" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotionalAmount_01a03970-9e9e-74a1-9737-31b22c9da731" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7b7d-9ad9-f2868477b9ab" xlink:to="loc_ifrs-full_NotionalAmount_01a03970-9e9e-74a1-9737-31b22c9da731" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AverageContractFinancialTerm_01a03970-9e9e-75a1-a620-968f857d63a1" xlink:href="cve-20260930.xsd#cve_AverageContractFinancialTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7b7d-9ad9-f2868477b9ab" xlink:to="loc_cve_AverageContractFinancialTerm_01a03970-9e9e-75a1-a620-968f857d63a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_PercentageOfCreditExposuresUsingExternalCreditGradingSystem_01a03970-9e9e-72d5-9c96-158f11a529a7" xlink:href="cve-20260930.xsd#cve_PercentageOfCreditExposuresUsingExternalCreditGradingSystem"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7b7d-9ad9-f2868477b9ab" xlink:to="loc_cve_PercentageOfCreditExposuresUsingExternalCreditGradingSystem_01a03970-9e9e-72d5-9c96-158f11a529a7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_PercentageOfAccountsReceivableOutstandingLessThan60Days_01a03970-9e9e-7f5d-9acd-c9ef786a5122" xlink:href="cve-20260930.xsd#cve_PercentageOfAccountsReceivableOutstandingLessThan60Days"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7b7d-9ad9-f2868477b9ab" xlink:to="loc_cve_PercentageOfAccountsReceivableOutstandingLessThan60Days_01a03970-9e9e-7f5d-9acd-c9ef786a5122" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfDaysOutstandingForCreditExposuresUsingExternalCreditGradingSystem_01a03970-9e9e-7b00-8f25-feadf0d74ee0" xlink:href="cve-20260930.xsd#cve_NumberOfDaysOutstandingForCreditExposuresUsingExternalCreditGradingSystem"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7b7d-9ad9-f2868477b9ab" xlink:to="loc_cve_NumberOfDaysOutstandingForCreditExposuresUsingExternalCreditGradingSystem_01a03970-9e9e-7b00-8f25-feadf0d74ee0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpectedCreditLossRate_01a03970-9e9e-74ba-9a79-fad38124a5df" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpectedCreditLossRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7b7d-9ad9-f2868477b9ab" xlink:to="loc_ifrs-full_ExpectedCreditLossRate_01a03970-9e9e-74ba-9a79-fad38124a5df" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TargetNetDebtToAdjustedEarningsBeforeInterestTaxesDepreciationDepletionAndAmortizationRatio_01a03970-9e9e-7e0e-815a-5a6f1350a2b5" xlink:href="cve-20260930.xsd#cve_TargetNetDebtToAdjustedEarningsBeforeInterestTaxesDepreciationDepletionAndAmortizationRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7b7d-9ad9-f2868477b9ab" xlink:to="loc_cve_TargetNetDebtToAdjustedEarningsBeforeInterestTaxesDepreciationDepletionAndAmortizationRatio_01a03970-9e9e-7e0e-815a-5a6f1350a2b5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AverageCrudeOilPrice_01a03970-9e9e-7b99-b705-7cb1c3b47616" xlink:href="cve-20260930.xsd#cve_AverageCrudeOilPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7b7d-9ad9-f2868477b9ab" xlink:to="loc_cve_AverageCrudeOilPrice_01a03970-9e9e-7b99-b705-7cb1c3b47616" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/RISKMANAGEMENTNetFairValueofRiskManagementPositionsDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#RISKMANAGEMENTNetFairValueofRiskManagementPositionsDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/RISKMANAGEMENTNetFairValueofRiskManagementPositionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfDerivativeFinancialInstrumentsLineItems_01a03970-9e9e-723d-a1d3-b97c618be6a1" xlink:href="cve-20260930.xsd#cve_DisclosureOfDerivativeFinancialInstrumentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfDerivativeFinancialInstrumentsTable_01a03970-9e9e-7ef8-9b84-d23059ab7351" xlink:href="cve-20260930.xsd#cve_DisclosureOfDerivativeFinancialInstrumentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cve_DisclosureOfDerivativeFinancialInstrumentsLineItems_01a03970-9e9e-723d-a1d3-b97c618be6a1" xlink:to="loc_cve_DisclosureOfDerivativeFinancialInstrumentsTable_01a03970-9e9e-7ef8-9b84-d23059ab7351" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_FinancialInstrumentsAxis_01a03970-9e9e-7612-9caa-81f44268a446" xlink:href="cve-20260930.xsd#cve_FinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfDerivativeFinancialInstrumentsTable_01a03970-9e9e-7ef8-9b84-d23059ab7351" xlink:to="loc_cve_FinancialInstrumentsAxis_01a03970-9e9e-7612-9caa-81f44268a446" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_FinancialInstrumentsDomain_01a03970-9e9e-7612-9caa-81f44268a446_default" xlink:href="cve-20260930.xsd#cve_FinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cve_FinancialInstrumentsAxis_01a03970-9e9e-7612-9caa-81f44268a446" xlink:to="loc_cve_FinancialInstrumentsDomain_01a03970-9e9e-7612-9caa-81f44268a446_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_FinancialInstrumentsDomain_01a03970-9e9e-73a7-8457-7e3fc4ee0885" xlink:href="cve-20260930.xsd#cve_FinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cve_FinancialInstrumentsAxis_01a03970-9e9e-7612-9caa-81f44268a446" xlink:to="loc_cve_FinancialInstrumentsDomain_01a03970-9e9e-73a7-8457-7e3fc4ee0885" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_WestTexasIntermediateFixedSellMember_01a03970-9e9e-7f90-b83a-051d231ab4e3" xlink:href="cve-20260930.xsd#cve_WestTexasIntermediateFixedSellMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_FinancialInstrumentsDomain_01a03970-9e9e-73a7-8457-7e3fc4ee0885" xlink:to="loc_cve_WestTexasIntermediateFixedSellMember_01a03970-9e9e-7f90-b83a-051d231ab4e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_WestTexasIntermediateFixedBuyMember_01a03970-9e9e-7502-a34f-adeb809c275d" xlink:href="cve-20260930.xsd#cve_WestTexasIntermediateFixedBuyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_FinancialInstrumentsDomain_01a03970-9e9e-73a7-8457-7e3fc4ee0885" xlink:to="loc_cve_WestTexasIntermediateFixedBuyMember_01a03970-9e9e-7502-a34f-adeb809c275d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_OtherFinancialPositionsMember_01a03970-9e9e-72c7-81d1-5d2ff6c97a0c" xlink:href="cve-20260930.xsd#cve_OtherFinancialPositionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_FinancialInstrumentsDomain_01a03970-9e9e-73a7-8457-7e3fc4ee0885" xlink:to="loc_cve_OtherFinancialPositionsMember_01a03970-9e9e-72c7-81d1-5d2ff6c97a0c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-75c6-9605-f762c78a556a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfDerivativeFinancialInstrumentsTable_01a03970-9e9e-7ef8-9b84-d23059ab7351" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-75c6-9605-f762c78a556a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-75c6-9605-f762c78a556a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-75c6-9605-f762c78a556a" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-75c6-9605-f762c78a556a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7d52-b21a-e6578fdc1b4e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-75c6-9605-f762c78a556a" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7d52-b21a-e6578fdc1b4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CrudeOilAndCondensateContractsMember_01a03970-9e9e-79b2-993c-3d3535666c46" xlink:href="cve-20260930.xsd#cve_CrudeOilAndCondensateContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7d52-b21a-e6578fdc1b4e" xlink:to="loc_cve_CrudeOilAndCondensateContractsMember_01a03970-9e9e-79b2-993c-3d3535666c46" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_PowerSwapContractsMember_01a03970-9e9e-7725-a422-714ba96e4b3f" xlink:href="cve-20260930.xsd#cve_PowerSwapContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7d52-b21a-e6578fdc1b4e" xlink:to="loc_cve_PowerSwapContractsMember_01a03970-9e9e-7725-a422-714ba96e4b3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RenewablePowerContractsMember_01a03970-9e9e-78ac-a68d-1e14082d0575" xlink:href="cve-20260930.xsd#cve_RenewablePowerContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7d52-b21a-e6578fdc1b4e" xlink:to="loc_cve_RenewablePowerContractsMember_01a03970-9e9e-78ac-a68d-1e14082d0575" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ForeignExchangeContractsMember_01a03970-9e9e-7acb-8be6-455a46b044fa" xlink:href="cve-20260930.xsd#cve_ForeignExchangeContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7d52-b21a-e6578fdc1b4e" xlink:to="loc_cve_ForeignExchangeContractsMember_01a03970-9e9e-7acb-8be6-455a46b044fa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TypesOfFinancialInstrumentsAxis_01a05c6e-5954-78da-99d0-97b4e3d9ab4d" xlink:href="cve-20260930.xsd#cve_TypesOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfDerivativeFinancialInstrumentsTable_01a03970-9e9e-7ef8-9b84-d23059ab7351" xlink:to="loc_cve_TypesOfFinancialInstrumentsAxis_01a05c6e-5954-78da-99d0-97b4e3d9ab4d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TypesOfFinancialInstrumentsDomain_01a05c6e-5954-78da-99d0-97b4e3d9ab4d_default" xlink:href="cve-20260930.xsd#cve_TypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_cve_TypesOfFinancialInstrumentsAxis_01a05c6e-5954-78da-99d0-97b4e3d9ab4d" xlink:to="loc_cve_TypesOfFinancialInstrumentsDomain_01a05c6e-5954-78da-99d0-97b4e3d9ab4d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TypesOfFinancialInstrumentsDomain_01a05c6e-5954-7d2c-b478-586c0249a740" xlink:href="cve-20260930.xsd#cve_TypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_cve_TypesOfFinancialInstrumentsAxis_01a05c6e-5954-78da-99d0-97b4e3d9ab4d" xlink:to="loc_cve_TypesOfFinancialInstrumentsDomain_01a05c6e-5954-7d2c-b478-586c0249a740" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_FairValueDerivativeFinancialInstrumentsMember_01a05c6e-5954-792e-9924-b3ba6f794889" xlink:href="cve-20260930.xsd#cve_FairValueDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_TypesOfFinancialInstrumentsDomain_01a05c6e-5954-7d2c-b478-586c0249a740" xlink:to="loc_cve_FairValueDerivativeFinancialInstrumentsMember_01a05c6e-5954-792e-9924-b3ba6f794889" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_FinancialInstrumentsNotionalVolume_01a03970-9e9e-70a1-991a-1002493ee20d" xlink:href="cve-20260930.xsd#cve_FinancialInstrumentsNotionalVolume"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfDerivativeFinancialInstrumentsLineItems_01a03970-9e9e-723d-a1d3-b97c618be6a1" xlink:to="loc_cve_FinancialInstrumentsNotionalVolume_01a03970-9e9e-70a1-991a-1002493ee20d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_WeightedAveragePriceOfFinancialInstrument_01a03970-9e9e-77dd-b27e-8c3615c61e02" xlink:href="cve-20260930.xsd#cve_WeightedAveragePriceOfFinancialInstrument"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfDerivativeFinancialInstrumentsLineItems_01a03970-9e9e-723d-a1d3-b97c618be6a1" xlink:to="loc_cve_WeightedAveragePriceOfFinancialInstrument_01a03970-9e9e-77dd-b27e-8c3615c61e02" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_FairValueOfDerivativeFinancialInstrumentsNet_01a03970-9e9e-7902-ac1d-d2b9d10b3ac8" xlink:href="cve-20260930.xsd#cve_FairValueOfDerivativeFinancialInstrumentsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfDerivativeFinancialInstrumentsLineItems_01a03970-9e9e-723d-a1d3-b97c618be6a1" xlink:to="loc_cve_FairValueOfDerivativeFinancialInstrumentsNet_01a03970-9e9e-7902-ac1d-d2b9d10b3ac8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AverageContractFinancialTerm_01a05c6e-5954-706b-9db9-076808a9f6a8" xlink:href="cve-20260930.xsd#cve_AverageContractFinancialTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfDerivativeFinancialInstrumentsLineItems_01a03970-9e9e-723d-a1d3-b97c618be6a1" xlink:to="loc_cve_AverageContractFinancialTerm_01a05c6e-5954-706b-9db9-076808a9f6a8" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/RISKMANAGEMENTImpactofFluctuatingCommodityPricesandInterestRatesonCompanySOpenRiskManagementPositionsDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#RISKMANAGEMENTImpactofFluctuatingCommodityPricesandInterestRatesonCompanySOpenRiskManagementPositionsDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/RISKMANAGEMENTImpactofFluctuatingCommodityPricesandInterestRatesonCompanySOpenRiskManagementPositionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7f24-b4e8-df0d02084271" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_01a03970-9e9e-7ddd-b194-e5083db555ab" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7f24-b4e8-df0d02084271" xlink:to="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_01a03970-9e9e-7ddd-b194-e5083db555ab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis_01a03970-9e9e-7b94-8117-aadfe2ba4b75" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_01a03970-9e9e-7ddd-b194-e5083db555ab" xlink:to="loc_ifrs-full_TypesOfRisksAxis_01a03970-9e9e-7b94-8117-aadfe2ba4b75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-7b94-8117-aadfe2ba4b75_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_01a03970-9e9e-7b94-8117-aadfe2ba4b75" xlink:to="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-7b94-8117-aadfe2ba4b75_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-70e5-a349-44c48c73c3d3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_01a03970-9e9e-7b94-8117-aadfe2ba4b75" xlink:to="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-70e5-a349-44c48c73c3d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CommodityPriceRiskMember_01a03970-9e9e-7b39-889d-cc59a36007ba" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CommodityPriceRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-70e5-a349-44c48c73c3d3" xlink:to="loc_ifrs-full_CommodityPriceRiskMember_01a03970-9e9e-7b39-889d-cc59a36007ba" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrencyRiskMember_01a03970-9e9e-70a0-b99a-556b4cae73e1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrencyRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_01a03970-9e9e-70e5-a349-44c48c73c3d3" xlink:to="loc_ifrs-full_CurrencyRiskMember_01a03970-9e9e-70a0-b99a-556b4cae73e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-7634-b20e-941b48d62399" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsTable_01a03970-9e9e-7ddd-b194-e5083db555ab" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-7634-b20e-941b48d62399" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7634-b20e-941b48d62399_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-7634-b20e-941b48d62399" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7634-b20e-941b48d62399_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7745-82e1-3cd7ef9c2167" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_01a03970-9e9e-7634-b20e-941b48d62399" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7745-82e1-3cd7ef9c2167" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CrudeOilContractsMember_01a03970-9e9e-7100-b8f8-a618e3da4081" xlink:href="cve-20260930.xsd#cve_CrudeOilContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7745-82e1-3cd7ef9c2167" xlink:to="loc_cve_CrudeOilContractsMember_01a03970-9e9e-7100-b8f8-a618e3da4081" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_WCSAndCondensateDifferentialMember_01a03970-9e9e-7b74-8491-b676420a8adb" xlink:href="cve-20260930.xsd#cve_WCSAndCondensateDifferentialMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7745-82e1-3cd7ef9c2167" xlink:to="loc_cve_WCSAndCondensateDifferentialMember_01a03970-9e9e-7b74-8491-b676420a8adb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_WCSHardistyMember_01a03970-9e9e-7a3d-a003-09be5da93873" xlink:href="cve-20260930.xsd#cve_WCSHardistyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7745-82e1-3cd7ef9c2167" xlink:to="loc_cve_WCSHardistyMember_01a03970-9e9e-7a3d-a003-09be5da93873" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RefinedProductsMember_01a03970-9e9e-7b3d-a9ba-f50e70b9b3bb" xlink:href="cve-20260930.xsd#cve_RefinedProductsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7745-82e1-3cd7ef9c2167" xlink:to="loc_cve_RefinedProductsMember_01a03970-9e9e-7b3d-a9ba-f50e70b9b3bb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NaturalGasCommodityPriceMember_01a03970-9e9e-7b3b-8806-1f7e7756761f" xlink:href="cve-20260930.xsd#cve_NaturalGasCommodityPriceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7745-82e1-3cd7ef9c2167" xlink:to="loc_cve_NaturalGasCommodityPriceMember_01a03970-9e9e-7b3b-8806-1f7e7756761f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NaturalGasContractsMember_01a03970-9e9e-7ff5-8054-b1e4e83d7963" xlink:href="cve-20260930.xsd#cve_NaturalGasContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7745-82e1-3cd7ef9c2167" xlink:to="loc_cve_NaturalGasContractsMember_01a03970-9e9e-7ff5-8054-b1e4e83d7963" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_PowerCommodityMember_01a03970-9e9e-7d23-b542-30e6278ff995" xlink:href="cve-20260930.xsd#cve_PowerCommodityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7745-82e1-3cd7ef9c2167" xlink:to="loc_cve_PowerCommodityMember_01a03970-9e9e-7d23-b542-30e6278ff995" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_USToCanadianDollarExchangeRateMember_01a03970-9e9e-7b8a-848e-6afbe89e4d92" xlink:href="cve-20260930.xsd#cve_USToCanadianDollarExchangeRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_01a03970-9e9e-7745-82e1-3cd7ef9c2167" xlink:to="loc_cve_USToCanadianDollarExchangeRateMember_01a03970-9e9e-7b8a-848e-6afbe89e4d92" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ChangeInPriceEstimationUnderSensitivityAnalysis_01a03970-9e9e-7119-9300-de9239ba1562" xlink:href="cve-20260930.xsd#cve_ChangeInPriceEstimationUnderSensitivityAnalysis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7f24-b4e8-df0d02084271" xlink:to="loc_cve_ChangeInPriceEstimationUnderSensitivityAnalysis_01a03970-9e9e-7119-9300-de9239ba1562" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TheoreticalImpactToProfitLossFromIncreaseInCommoditySensitivity_01a03970-9e9e-720a-b0c6-7e9bfebda59a" xlink:href="cve-20260930.xsd#cve_TheoreticalImpactToProfitLossFromIncreaseInCommoditySensitivity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7f24-b4e8-df0d02084271" xlink:to="loc_cve_TheoreticalImpactToProfitLossFromIncreaseInCommoditySensitivity_01a03970-9e9e-720a-b0c6-7e9bfebda59a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TheoreticalImpactToProfitLossFromDecreaseInCommoditySensitivity_01a03970-9e9e-7938-a2e9-c15e10b5c15a" xlink:href="cve-20260930.xsd#cve_TheoreticalImpactToProfitLossFromDecreaseInCommoditySensitivity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNatureAndExtentOfRisksArisingFromFinancialInstrumentsLineItems_01a03970-9e9e-7f24-b4e8-df0d02084271" xlink:to="loc_cve_TheoreticalImpactToProfitLossFromDecreaseInCommoditySensitivity_01a03970-9e9e-7938-a2e9-c15e10b5c15a" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/RISKMANAGEMENTUndiscountedCashOutflowsRelatingtoFinancialLiabilitiesDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#RISKMANAGEMENTUndiscountedCashOutflowsRelatingtoFinancialLiabilitiesDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/RISKMANAGEMENTUndiscountedCashOutflowsRelatingtoFinancialLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfMaturityAnalysisForFinancialLiabilitiesLineItems_01a03970-9e9e-7244-87e9-839f696bc04d" xlink:href="cve-20260930.xsd#cve_DisclosureOfMaturityAnalysisForFinancialLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesTable_01a03970-9e9e-7c80-b017-81feaf4eeaac" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cve_DisclosureOfMaturityAnalysisForFinancialLiabilitiesLineItems_01a03970-9e9e-7244-87e9-839f696bc04d" xlink:to="loc_ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesTable_01a03970-9e9e-7c80-b017-81feaf4eeaac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9e9e-7474-87eb-ff6f9e1ef6a9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesTable_01a03970-9e9e-7c80-b017-81feaf4eeaac" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9e9e-7474-87eb-ff6f9e1ef6a9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9e-7474-87eb-ff6f9e1ef6a9_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9e9e-7474-87eb-ff6f9e1ef6a9" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9e-7474-87eb-ff6f9e1ef6a9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9e-72dc-ba28-b2c28aa13940" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9e9e-7474-87eb-ff6f9e1ef6a9" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9e-72dc-ba28-b2c28aa13940" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AccountsPayablesAndAccruedLiabilitiesMember_01a03970-9e9e-7546-af5d-4b51379f892a" xlink:href="cve-20260930.xsd#cve_AccountsPayablesAndAccruedLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9e-72dc-ba28-b2c28aa13940" xlink:to="loc_cve_AccountsPayablesAndAccruedLiabilitiesMember_01a03970-9e9e-7546-af5d-4b51379f892a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilitiesMember_01a03970-9e9e-7fc1-9714-8735f8e458eb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9e-72dc-ba28-b2c28aa13940" xlink:to="loc_ifrs-full_LeaseLiabilitiesMember_01a03970-9e9e-7fc1-9714-8735f8e458eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermBorrowingsMember_01a03970-9e9e-7365-b102-2bd15d555fb7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9e9e-72dc-ba28-b2c28aa13940" xlink:to="loc_ifrs-full_LongtermBorrowingsMember_01a03970-9e9e-7365-b102-2bd15d555fb7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityAxis_01a03970-9e9e-7534-bf59-b474b84cb66d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesTable_01a03970-9e9e-7c80-b017-81feaf4eeaac" xlink:to="loc_ifrs-full_MaturityAxis_01a03970-9e9e-7534-bf59-b474b84cb66d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain_01a03970-9e9e-7534-bf59-b474b84cb66d_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_01a03970-9e9e-7534-bf59-b474b84cb66d" xlink:to="loc_ifrs-full_MaturityDomain_01a03970-9e9e-7534-bf59-b474b84cb66d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain_01a03970-9e9e-733f-82f0-3f54143e7b18" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_01a03970-9e9e-7534-bf59-b474b84cb66d" xlink:to="loc_ifrs-full_MaturityDomain_01a03970-9e9e-733f-82f0-3f54143e7b18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember_01a03970-9e9e-7afc-8d38-302121b8a8b3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotLaterThanOneYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a03970-9e9e-733f-82f0-3f54143e7b18" xlink:to="loc_ifrs-full_NotLaterThanOneYearMember_01a03970-9e9e-7afc-8d38-302121b8a8b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember_01a03970-9e9e-7ef0-a2c0-ddb74e6eb51e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a03970-9e9e-733f-82f0-3f54143e7b18" xlink:to="loc_ifrs-full_LaterThanOneYearAndNotLaterThanThreeYearsMember_01a03970-9e9e-7ef0-a2c0-ddb74e6eb51e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember_01a03970-9e9e-71a8-9211-f77c60299fda" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a03970-9e9e-733f-82f0-3f54143e7b18" xlink:to="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFiveYearsMember_01a03970-9e9e-71a8-9211-f77c60299fda" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanFiveYearsMember_01a03970-9e9e-711a-83a5-ed63b31d9cc0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanFiveYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a03970-9e9e-733f-82f0-3f54143e7b18" xlink:to="loc_ifrs-full_LaterThanFiveYearsMember_01a03970-9e9e-711a-83a5-ed63b31d9cc0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonderivativeFinancialLiabilitiesUndiscountedCashFlows_01a03970-9e9e-7f80-b1b3-9b18f06ff5d1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonderivativeFinancialLiabilitiesUndiscountedCashFlows"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfMaturityAnalysisForFinancialLiabilitiesLineItems_01a03970-9e9e-7244-87e9-839f696bc04d" xlink:to="loc_ifrs-full_NonderivativeFinancialLiabilitiesUndiscountedCashFlows_01a03970-9e9e-7f80-b1b3-9b18f06ff5d1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/SUPPLEMENTARYCASHFLOWINFORMATIONNonCashWorkingCapitalDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#SUPPLEMENTARYCASHFLOWINFORMATIONNonCashWorkingCapitalDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/SUPPLEMENTARYCASHFLOWINFORMATIONNonCashWorkingCapitalDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfSupplementaryCashFlowInformationLineItems_01a03970-9e9e-7495-a71e-4e718351301e" xlink:href="cve-20260930.xsd#cve_DisclosureOfSupplementaryCashFlowInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfSupplementaryCashFlowInformationTable_01a03970-9e9e-7262-9638-b62c2477b5b7" xlink:href="cve-20260930.xsd#cve_DisclosureOfSupplementaryCashFlowInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cve_DisclosureOfSupplementaryCashFlowInformationLineItems_01a03970-9e9e-7495-a71e-4e718351301e" xlink:to="loc_cve_DisclosureOfSupplementaryCashFlowInformationTable_01a03970-9e9e-7262-9638-b62c2477b5b7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssets_01a03970-9e9e-7a36-9c74-8e640be766e8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfSupplementaryCashFlowInformationLineItems_01a03970-9e9e-7495-a71e-4e718351301e" xlink:to="loc_ifrs-full_CurrentAssets_01a03970-9e9e-7a36-9c74-8e640be766e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilities_01a03970-9e9e-790e-8412-93063143e4b0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfSupplementaryCashFlowInformationLineItems_01a03970-9e9e-7495-a71e-4e718351301e" xlink:to="loc_ifrs-full_CurrentLiabilities_01a03970-9e9e-790e-8412-93063143e4b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_WorkingCapital_01a03970-9e9e-7db3-ba52-ae9455ce8181" xlink:href="cve-20260930.xsd#cve_WorkingCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfSupplementaryCashFlowInformationLineItems_01a03970-9e9e-7495-a71e-4e718351301e" xlink:to="loc_cve_WorkingCapital_01a03970-9e9e-7db3-ba52-ae9455ce8181" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable_01a03970-9e9e-7ed0-9251-de0ef3b43e1a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfSupplementaryCashFlowInformationLineItems_01a03970-9e9e-7495-a71e-4e718351301e" xlink:to="loc_ifrs-full_AdjustmentsForDecreaseIncreaseInTradeAccountReceivable_01a03970-9e9e-7ed0-9251-de0ef3b43e1a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AdjustmentsForDecreaseIncreaseInIncomeTaxReceivables_01a03970-9e9e-71df-9489-3583e45cbda5" xlink:href="cve-20260930.xsd#cve_AdjustmentsForDecreaseIncreaseInIncomeTaxReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfSupplementaryCashFlowInformationLineItems_01a03970-9e9e-7495-a71e-4e718351301e" xlink:to="loc_cve_AdjustmentsForDecreaseIncreaseInIncomeTaxReceivables_01a03970-9e9e-71df-9489-3583e45cbda5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories_01a03970-9e9e-777b-bf10-bdbce40c2859" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfSupplementaryCashFlowInformationLineItems_01a03970-9e9e-7495-a71e-4e718351301e" xlink:to="loc_ifrs-full_AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories_01a03970-9e9e-777b-bf10-bdbce40c2859" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AdjustmentsForIncreaseDecreaseinAccountsPayableAndAccruedLiabilities_01a03970-9e9e-74f9-a297-ca2a03b395d1" xlink:href="cve-20260930.xsd#cve_AdjustmentsForIncreaseDecreaseinAccountsPayableAndAccruedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfSupplementaryCashFlowInformationLineItems_01a03970-9e9e-7495-a71e-4e718351301e" xlink:to="loc_cve_AdjustmentsForIncreaseDecreaseinAccountsPayableAndAccruedLiabilities_01a03970-9e9e-74f9-a297-ca2a03b395d1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdjustmentsForIncomeTaxExpense_01a03970-9e9e-7619-9860-3b8c756c5968" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdjustmentsForIncomeTaxExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfSupplementaryCashFlowInformationLineItems_01a03970-9e9e-7495-a71e-4e718351301e" xlink:to="loc_ifrs-full_AdjustmentsForIncomeTaxExpense_01a03970-9e9e-7619-9860-3b8c756c5968" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInWorkingCapital_01a03970-9e9e-7154-a90c-16026b36e338" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseInWorkingCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfSupplementaryCashFlowInformationLineItems_01a03970-9e9e-7495-a71e-4e718351301e" xlink:to="loc_ifrs-full_IncreaseDecreaseInWorkingCapital_01a03970-9e9e-7154-a90c-16026b36e338" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_IncreaseDecreaseinWorkingCapitalfromOperatingActivities_01a03970-9e9e-7667-9620-b0ba0bdfdb2a" xlink:href="cve-20260930.xsd#cve_IncreaseDecreaseinWorkingCapitalfromOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfSupplementaryCashFlowInformationLineItems_01a03970-9e9e-7495-a71e-4e718351301e" xlink:to="loc_cve_IncreaseDecreaseinWorkingCapitalfromOperatingActivities_01a03970-9e9e-7667-9620-b0ba0bdfdb2a" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_IncreaseDecreaseinWorkingCapitalfromInvestingActivities_01a03970-9e9e-7378-aa1d-7bdbe3cc85ce" xlink:href="cve-20260930.xsd#cve_IncreaseDecreaseinWorkingCapitalfromInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfSupplementaryCashFlowInformationLineItems_01a03970-9e9e-7495-a71e-4e718351301e" xlink:to="loc_cve_IncreaseDecreaseinWorkingCapitalfromInvestingActivities_01a03970-9e9e-7378-aa1d-7bdbe3cc85ce" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/SUPPLEMENTARYCASHFLOWINFORMATIONReconciliationofLiabilitiestoCashFlowsfromFinancingActivitiesDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#SUPPLEMENTARYCASHFLOWINFORMATIONReconciliationofLiabilitiestoCashFlowsfromFinancingActivitiesDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/SUPPLEMENTARYCASHFLOWINFORMATIONReconciliationofLiabilitiestoCashFlowsfromFinancingActivitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_01a03970-9f7b-77b6-9353-34e742eb971f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfSupplementaryCashFlowInformationTable_01a03970-9f7b-77b3-8b5f-3badc29f3866" xlink:href="cve-20260930.xsd#cve_DisclosureOfSupplementaryCashFlowInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_01a03970-9f7b-77b6-9353-34e742eb971f" xlink:to="loc_cve_DisclosureOfSupplementaryCashFlowInformationTable_01a03970-9f7b-77b3-8b5f-3badc29f3866" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9f7b-7286-bf62-61c3e04c573a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfSupplementaryCashFlowInformationTable_01a03970-9f7b-77b3-8b5f-3badc29f3866" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9f7b-7286-bf62-61c3e04c573a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9f7b-7286-bf62-61c3e04c573a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9f7b-7286-bf62-61c3e04c573a" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9f7b-7286-bf62-61c3e04c573a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9f7b-7389-bf2b-3f145f11e9e9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_01a03970-9f7b-7286-bf62-61c3e04c573a" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9f7b-7389-bf2b-3f145f11e9e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DividendsPayableMember_01a03970-9f7b-7026-9188-2cf53f5ede9c" xlink:href="cve-20260930.xsd#cve_DividendsPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9f7b-7389-bf2b-3f145f11e9e9" xlink:to="loc_cve_DividendsPayableMember_01a03970-9f7b-7026-9188-2cf53f5ede9c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RepurchaseAgreementsPayableMember_01a03970-9f7b-75d7-ad7d-bad32eedc70e" xlink:href="cve-20260930.xsd#cve_RepurchaseAgreementsPayableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9f7b-7389-bf2b-3f145f11e9e9" xlink:to="loc_cve_RepurchaseAgreementsPayableMember_01a03970-9f7b-75d7-ad7d-bad32eedc70e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RepurchaseAgreementsPayableRINsMember_01a14515-e6c3-7030-afba-eb175f2374fa" xlink:href="cve-20260930.xsd#cve_RepurchaseAgreementsPayableRINsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_RepurchaseAgreementsPayableMember_01a03970-9f7b-75d7-ad7d-bad32eedc70e" xlink:to="loc_cve_RepurchaseAgreementsPayableRINsMember_01a14515-e6c3-7030-afba-eb175f2374fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShorttermBorrowingsMember_01a03970-9f7b-7723-a22e-b01c15f042fa" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShorttermBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9f7b-7389-bf2b-3f145f11e9e9" xlink:to="loc_ifrs-full_ShorttermBorrowingsMember_01a03970-9f7b-7723-a22e-b01c15f042fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LongtermBorrowingsMember_01a03970-9f7b-7f77-9cd7-11c487c692cd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LongtermBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9f7b-7389-bf2b-3f145f11e9e9" xlink:to="loc_ifrs-full_LongtermBorrowingsMember_01a03970-9f7b-7f77-9cd7-11c487c692cd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilitiesMember_01a03970-9f7b-774f-b7f1-a52d5210bdb4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_01a03970-9f7b-7389-bf2b-3f145f11e9e9" xlink:to="loc_ifrs-full_LeaseLiabilitiesMember_01a03970-9f7b-774f-b7f1-a52d5210bdb4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9f7b-75dc-a87a-052346c8ba84" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfSupplementaryCashFlowInformationTable_01a03970-9f7b-77b3-8b5f-3badc29f3866" xlink:to="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9f7b-75dc-a87a-052346c8ba84" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9f7b-75dc-a87a-052346c8ba84_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9f7b-75dc-a87a-052346c8ba84" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9f7b-75dc-a87a-052346c8ba84_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9f7b-73f6-9d02-1c8e70b26ac6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_01a03970-9f7b-75dc-a87a-052346c8ba84" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9f7b-73f6-9d02-1c8e70b26ac6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OrdinarySharesMember_01a03970-9f7b-7290-b6eb-0af8d160cb2a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OrdinarySharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9f7b-73f6-9d02-1c8e70b26ac6" xlink:to="loc_ifrs-full_OrdinarySharesMember_01a03970-9f7b-7290-b6eb-0af8d160cb2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PreferenceSharesMember_01a03970-9f7b-7cc6-a499-3e931d8dae50" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PreferenceSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_01a03970-9f7b-73f6-9d02-1c8e70b26ac6" xlink:to="loc_ifrs-full_PreferenceSharesMember_01a03970-9f7b-7cc6-a499-3e931d8dae50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendPayables_01a03970-9f7b-7411-9c54-70a873b42552" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendPayables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_01a03970-9f7b-77b6-9353-34e742eb971f" xlink:to="loc_ifrs-full_DividendPayables_01a03970-9f7b-7411-9c54-70a873b42552" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RepurchaseAgreementsPayable_01a03970-9f7b-7968-93d6-581759f28692" xlink:href="cve-20260930.xsd#cve_RepurchaseAgreementsPayable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_01a03970-9f7b-77b6-9353-34e742eb971f" xlink:to="loc_cve_RepurchaseAgreementsPayable_01a03970-9f7b-7968-93d6-581759f28692" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShorttermBorrowings_01a03970-9f7b-704f-982e-588e27e5a3af" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShorttermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_01a03970-9f7b-77b6-9353-34e742eb971f" xlink:to="loc_ifrs-full_ShorttermBorrowings_01a03970-9f7b-704f-982e-588e27e5a3af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LiabilitiesArisingFromFinancingActivities_01a03970-9f7b-73bd-94f8-033bc9fed9b6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_01a03970-9f7b-77b6-9353-34e742eb971f" xlink:to="loc_ifrs-full_LiabilitiesArisingFromFinancingActivities_01a03970-9f7b-73bd-94f8-033bc9fed9b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilities_01a03970-9f7b-744f-8468-8ac7edf4d938" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_01a03970-9f7b-77b6-9353-34e742eb971f" xlink:to="loc_ifrs-full_LeaseLiabilities_01a03970-9f7b-744f-8468-8ac7edf4d938" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesAbstract_01a03970-9f7b-736f-a168-7980b5748c33" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_01a03970-9f7b-77b6-9353-34e742eb971f" xlink:to="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesAbstract_01a03970-9f7b-736f-a168-7980b5748c33" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_01a03970-9f7b-7639-b5d4-6af1c0c60635" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesAbstract_01a03970-9f7b-736f-a168-7980b5748c33" xlink:to="loc_ifrs-full_CashFlowsUsedInObtainingControlOfSubsidiariesOrOtherBusinessesClassifiedAsInvestingActivities_01a03970-9f7b-7639-b5d4-6af1c0c60635" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NetIssuanceRepaymentOfShortTermBorrowings_01a03970-9f7b-7e11-8602-5783edfa8595" xlink:href="cve-20260930.xsd#cve_NetIssuanceRepaymentOfShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesAbstract_01a03970-9f7b-736f-a168-7980b5748c33" xlink:to="loc_cve_NetIssuanceRepaymentOfShortTermBorrowings_01a03970-9f7b-7e11-8602-5783edfa8595" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RepaymentsOfNoncurrentBorrowings_01a03970-9f7b-77c8-8930-8beeb67bb919" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RepaymentsOfNoncurrentBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesAbstract_01a03970-9f7b-736f-a168-7980b5748c33" xlink:to="loc_ifrs-full_RepaymentsOfNoncurrentBorrowings_01a03970-9f7b-77c8-8930-8beeb67bb919" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_01a03970-9f7b-750a-ac6c-6d845a2a12b4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesAbstract_01a03970-9f7b-736f-a168-7980b5748c33" xlink:to="loc_ifrs-full_PaymentsOfLeaseLiabilitiesClassifiedAsFinancingActivities_01a03970-9f7b-750a-ac6c-6d845a2a12b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_01a03970-9f7b-7f4e-8063-b7afe64330aa" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesAbstract_01a03970-9f7b-736f-a168-7980b5748c33" xlink:to="loc_ifrs-full_ProceedsFromBorrowingsClassifiedAsFinancingActivities_01a03970-9f7b-7f4e-8063-b7afe64330aa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_01a03970-9f7b-71dc-bc37-20aaf88bc0b1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesAbstract_01a03970-9f7b-736f-a168-7980b5748c33" xlink:to="loc_ifrs-full_RepaymentsOfBorrowingsClassifiedAsFinancingActivities_01a03970-9f7b-71dc-bc37-20aaf88bc0b1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities_01a03970-9f7b-7a8a-baa6-8b1b53214250" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesAbstract_01a03970-9f7b-736f-a168-7980b5748c33" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughFinancingCashFlowsLiabilitiesArisingFromFinancingActivities_01a03970-9f7b-7a8a-baa6-8b1b53214250" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NonCashChangesAbstract_01a03970-9f7b-705e-99ed-911324416024" xlink:href="cve-20260930.xsd#cve_NonCashChangesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems_01a03970-9f7b-77b6-9353-34e742eb971f" xlink:to="loc_cve_NonCashChangesAbstract_01a03970-9f7b-705e-99ed-911324416024" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DivestitureOfShortTermBorrowings_01a05c5c-36aa-71a4-ad6c-4b8073d5228e" xlink:href="cve-20260930.xsd#cve_DivestitureOfShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_NonCashChangesAbstract_01a03970-9f7b-705e-99ed-911324416024" xlink:to="loc_cve_DivestitureOfShortTermBorrowings_01a05c5c-36aa-71a4-ad6c-4b8073d5228e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughOtherChangesLiabilitiesArisingFromFinancingActivities_01a03970-9f7b-7751-bdd0-52fa16aaa471" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughOtherChangesLiabilitiesArisingFromFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_NonCashChangesAbstract_01a03970-9f7b-705e-99ed-911324416024" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughOtherChangesLiabilitiesArisingFromFinancingActivities_01a03970-9f7b-7751-bdd0-52fa16aaa471" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_LeaseAddition_01a03970-9f7b-7002-b76c-9619013b93b6" xlink:href="cve-20260930.xsd#cve_LeaseAddition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_NonCashChangesAbstract_01a03970-9f7b-705e-99ed-911324416024" xlink:to="loc_cve_LeaseAddition_01a03970-9f7b-7002-b76c-9619013b93b6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_LeaseDivestitures_01a05c64-9168-7317-a74e-9a7d1dbac3f9" xlink:href="cve-20260930.xsd#cve_LeaseDivestitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_NonCashChangesAbstract_01a03970-9f7b-705e-99ed-911324416024" xlink:to="loc_cve_LeaseDivestitures_01a05c64-9168-7317-a74e-9a7d1dbac3f9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_LeaseModifications_01a17958-314b-7d3b-9f97-102e970144c8" xlink:href="cve-20260930.xsd#cve_LeaseModifications"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_NonCashChangesAbstract_01a03970-9f7b-705e-99ed-911324416024" xlink:to="loc_cve_LeaseModifications_01a17958-314b-7d3b-9f97-102e970144c8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_IncreaseDecreaseThroughDividendsDeclaredLiabilitiesArisingFromFinancingActivities_01a03970-9f7b-79da-8014-32b89dbfcb06" xlink:href="cve-20260930.xsd#cve_IncreaseDecreaseThroughDividendsDeclaredLiabilitiesArisingFromFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_NonCashChangesAbstract_01a03970-9f7b-705e-99ed-911324416024" xlink:to="loc_cve_IncreaseDecreaseThroughDividendsDeclaredLiabilitiesArisingFromFinancingActivities_01a03970-9f7b-79da-8014-32b89dbfcb06" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities_01a03970-9f7b-729b-a20a-412c2c828d6f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_NonCashChangesAbstract_01a03970-9f7b-705e-99ed-911324416024" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughEffectOfChangesInForeignExchangeRatesLiabilitiesArisingFromFinancingActivities_01a03970-9f7b-729b-a20a-412c2c828d6f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendPayables_01a03970-9f7b-79d4-a2f5-93ae474f1ddc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendPayables"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RepurchaseAgreementsPayable_01a03970-9f7b-7843-acec-d7a46483b320" xlink:href="cve-20260930.xsd#cve_RepurchaseAgreementsPayable"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShorttermBorrowings_01a03970-9f7b-7341-b92b-74adb6e7124d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShorttermBorrowings"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LiabilitiesArisingFromFinancingActivities_01a03970-9f7b-792f-b981-7f645a96f671" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesArisingFromFinancingActivities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilities_01a03970-9f7b-7a98-ba72-5944da6abcb9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseLiabilities"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/COMMITMENTSANDCONTINGENCIESFuturePaymentsforCommitmentsDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#COMMITMENTSANDCONTINGENCIESFuturePaymentsforCommitmentsDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/COMMITMENTSANDCONTINGENCIESFuturePaymentsforCommitmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems_01a03970-9f7b-7619-b057-1aa3a449b229" xlink:href="cve-20260930.xsd#cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesTable_01a03970-9f7b-769b-aa2d-776bc8274536" xlink:href="cve-20260930.xsd#cve_DisclosureOfCommitmentsAndContingentLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems_01a03970-9f7b-7619-b057-1aa3a449b229" xlink:to="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesTable_01a03970-9f7b-769b-aa2d-776bc8274536" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityAxis_01a03970-9f7b-7d8c-aa20-5d6cb3c94896" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesTable_01a03970-9f7b-769b-aa2d-776bc8274536" xlink:to="loc_ifrs-full_MaturityAxis_01a03970-9f7b-7d8c-aa20-5d6cb3c94896" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain_01a03970-9f7b-7d8c-aa20-5d6cb3c94896_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_01a03970-9f7b-7d8c-aa20-5d6cb3c94896" xlink:to="loc_ifrs-full_MaturityDomain_01a03970-9f7b-7d8c-aa20-5d6cb3c94896_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain_01a03970-9f7b-7ba6-96ce-8ef20c9d6224" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_01a03970-9f7b-7d8c-aa20-5d6cb3c94896" xlink:to="loc_ifrs-full_MaturityDomain_01a03970-9f7b-7ba6-96ce-8ef20c9d6224" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember_01a03970-9f7b-78f9-92b7-c2280dd4f09e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotLaterThanOneYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a03970-9f7b-7ba6-96ce-8ef20c9d6224" xlink:to="loc_ifrs-full_NotLaterThanOneYearMember_01a03970-9f7b-78f9-92b7-c2280dd4f09e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_01a03970-9f7b-7217-b96b-98a66ef0dc33" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a03970-9f7b-7ba6-96ce-8ef20c9d6224" xlink:to="loc_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_01a03970-9f7b-7217-b96b-98a66ef0dc33" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_01a03970-9f7b-79bb-8cae-8da0ea27ca7e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a03970-9f7b-7ba6-96ce-8ef20c9d6224" xlink:to="loc_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_01a03970-9f7b-79bb-8cae-8da0ea27ca7e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_01a03970-9f7b-70c7-a830-acc50d14150b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a03970-9f7b-7ba6-96ce-8ef20c9d6224" xlink:to="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_01a03970-9f7b-70c7-a830-acc50d14150b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_01a03970-9f7b-7857-9370-fb401b210793" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a03970-9f7b-7ba6-96ce-8ef20c9d6224" xlink:to="loc_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_01a03970-9f7b-7857-9370-fb401b210793" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanFiveYearsAndNotLaterThanTenYearsMember_01a03970-9f7b-7ce2-a56e-2106ad068ef6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanFiveYearsAndNotLaterThanTenYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_01a03970-9f7b-7ba6-96ce-8ef20c9d6224" xlink:to="loc_ifrs-full_LaterThanFiveYearsAndNotLaterThanTenYearsMember_01a03970-9f7b-7ce2-a56e-2106ad068ef6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ContractualCommitmentsForTransportationAndStorage_01a03970-9f7b-71c8-b04f-0afe7ef683a5" xlink:href="cve-20260930.xsd#cve_ContractualCommitmentsForTransportationAndStorage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems_01a03970-9f7b-7619-b057-1aa3a449b229" xlink:to="loc_cve_ContractualCommitmentsForTransportationAndStorage_01a03970-9f7b-71c8-b04f-0afe7ef683a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_RealEstateCommitments_01a03970-9f7b-7579-ae3b-2604004be702" xlink:href="cve-20260930.xsd#cve_RealEstateCommitments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems_01a03970-9f7b-7619-b057-1aa3a449b229" xlink:to="loc_cve_RealEstateCommitments_01a03970-9f7b-7579-ae3b-2604004be702" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CommitmentsInRelationToJointVentures_01a03970-9f7b-77a6-a057-2cee56351929" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CommitmentsInRelationToJointVentures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems_01a03970-9f7b-7619-b057-1aa3a449b229" xlink:to="loc_ifrs-full_CommitmentsInRelationToJointVentures_01a03970-9f7b-77a6-a057-2cee56351929" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_OtherLongTermCommitments_01a03970-9f7b-7ffd-a0f1-ff1388040d26" xlink:href="cve-20260930.xsd#cve_OtherLongTermCommitments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems_01a03970-9f7b-7619-b057-1aa3a449b229" xlink:to="loc_cve_OtherLongTermCommitments_01a03970-9f7b-7ffd-a0f1-ff1388040d26" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CapitalCommitments_01a03970-9f7b-79ec-aa2a-dd117b4e2394" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CapitalCommitments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems_01a03970-9f7b-7619-b057-1aa3a449b229" xlink:to="loc_ifrs-full_CapitalCommitments_01a03970-9f7b-79ec-aa2a-dd117b4e2394" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/COMMITMENTSANDCONTINGENCIESAdditionalInformationDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#COMMITMENTSANDCONTINGENCIESAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/COMMITMENTSANDCONTINGENCIESAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems_01a03970-9f7b-7836-a3f5-545885e61d82" xlink:href="cve-20260930.xsd#cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesTable_01a03970-9f7b-72b4-83cf-81f16e564a4f" xlink:href="cve-20260930.xsd#cve_DisclosureOfCommitmentsAndContingentLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems_01a03970-9f7b-7836-a3f5-545885e61d82" xlink:to="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesTable_01a03970-9f7b-72b4-83cf-81f16e564a4f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsAxis_01a03970-9f7b-79ee-bc2f-dd4dfbe6a4c8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesTable_01a03970-9f7b-72b4-83cf-81f16e564a4f" xlink:to="loc_ifrs-full_BusinessCombinationsAxis_01a03970-9f7b-79ee-bc2f-dd4dfbe6a4c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_01a03970-9f7b-79ee-bc2f-dd4dfbe6a4c8_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_01a03970-9f7b-79ee-bc2f-dd4dfbe6a4c8" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_01a03970-9f7b-79ee-bc2f-dd4dfbe6a4c8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_01a03970-9f7b-749f-a581-3683f5fe4ed8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_01a03970-9f7b-79ee-bc2f-dd4dfbe6a4c8" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_01a03970-9f7b-749f-a581-3683f5fe4ed8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_HMLPMember_01a03970-9f7b-7470-a4ae-6264a3c71602" xlink:href="cve-20260930.xsd#cve_HMLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_01a03970-9f7b-749f-a581-3683f5fe4ed8" xlink:to="loc_cve_HMLPMember_01a03970-9f7b-7470-a4ae-6264a3c71602" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_01a03970-9f7b-71f4-87e7-177ba9292a92" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesTable_01a03970-9f7b-72b4-83cf-81f16e564a4f" xlink:to="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_01a03970-9f7b-71f4-87e7-177ba9292a92" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a03970-9f7b-71f4-87e7-177ba9292a92_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_01a03970-9f7b-71f4-87e7-177ba9292a92" xlink:to="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a03970-9f7b-71f4-87e7-177ba9292a92_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a03970-9f7b-788c-ab84-e50d6095a8ae" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis_01a03970-9f7b-71f4-87e7-177ba9292a92" xlink:to="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a03970-9f7b-788c-ab84-e50d6095a8ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_CommitmentsApprovedAndNotYetInServiceMember_01a03970-9f7b-7685-9775-6c16563be28b" xlink:href="cve-20260930.xsd#cve_CommitmentsApprovedAndNotYetInServiceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfPropertyPlantAndEquipmentDomain_01a03970-9f7b-788c-ab84-e50d6095a8ae" xlink:to="loc_cve_CommitmentsApprovedAndNotYetInServiceMember_01a03970-9f7b-7685-9775-6c16563be28b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeAxis_01a03970-9f7b-73f1-ba37-28923ce39ccc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesTable_01a03970-9f7b-72b4-83cf-81f16e564a4f" xlink:to="loc_ifrs-full_RangeAxis_01a03970-9f7b-73f1-ba37-28923ce39ccc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_01a03970-9f7b-73f1-ba37-28923ce39ccc_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_01a03970-9f7b-73f1-ba37-28923ce39ccc" xlink:to="loc_ifrs-full_RangeDomain_01a03970-9f7b-73f1-ba37-28923ce39ccc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_01a03970-9f7b-7102-ac19-5c089da48f30" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_01a03970-9f7b-73f1-ba37-28923ce39ccc" xlink:to="loc_ifrs-full_RangeDomain_01a03970-9f7b-7102-ac19-5c089da48f30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BottomOfRangeMember_01a03970-9f7b-7b49-ae05-342c88c76122" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_01a03970-9f7b-7102-ac19-5c089da48f30" xlink:to="loc_ifrs-full_BottomOfRangeMember_01a03970-9f7b-7b49-ae05-342c88c76122" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_ContractualCommitmentsForTransportationAndStorage_01a03970-9f7b-79a0-84a1-28c98e7eb56a" xlink:href="cve-20260930.xsd#cve_ContractualCommitmentsForTransportationAndStorage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems_01a03970-9f7b-7836-a3f5-545885e61d82" xlink:to="loc_cve_ContractualCommitmentsForTransportationAndStorage_01a03970-9f7b-79a0-84a1-28c98e7eb56a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_TransportationCommitmentsSubjectToRegulatoryApprovalOrApprovedButNotYetInServiceTerm_01a03970-9f7b-7a84-8500-8df9a02c72f6" xlink:href="cve-20260930.xsd#cve_TransportationCommitmentsSubjectToRegulatoryApprovalOrApprovedButNotYetInServiceTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems_01a03970-9f7b-7836-a3f5-545885e61d82" xlink:to="loc_cve_TransportationCommitmentsSubjectToRegulatoryApprovalOrApprovedButNotYetInServiceTerm_01a03970-9f7b-7a84-8500-8df9a02c72f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CapitalCommitments_01a03970-9f7b-7451-9794-e74189d0ada8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CapitalCommitments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems_01a03970-9f7b-7836-a3f5-545885e61d82" xlink:to="loc_ifrs-full_CapitalCommitments_01a03970-9f7b-7451-9794-e74189d0ada8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_LettersOfCreditIssuedAsSecurityForPerformance_01a03970-9f7b-7126-823d-195dda7ec6e2" xlink:href="cve-20260930.xsd#cve_LettersOfCreditIssuedAsSecurityForPerformance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cve_DisclosureOfCommitmentsAndContingentLiabilitiesLineItems_01a03970-9f7b-7836-a3f5-545885e61d82" xlink:to="loc_cve_LettersOfCreditIssuedAsSecurityForPerformance_01a03970-9f7b-7126-823d-195dda7ec6e2" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.cenovus.com/role/SUBSEQUENTEVENTDetails" xlink:type="simple" xlink:href="cve-20260930.xsd#SUBSEQUENTEVENTDetails"/>
  <link:definitionLink xlink:role="http://www.cenovus.com/role/SUBSEQUENTEVENTDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a1145a-3cd9-716b-899f-efe3267a7df6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_01a1145a-3cd9-73f8-9215-f0a52a5ae0a0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a1145a-3cd9-716b-899f-efe3267a7df6" xlink:to="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_01a1145a-3cd9-73f8-9215-f0a52a5ae0a0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsAxis_01a1145a-3cd9-721b-97b0-cc342efe735b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_01a1145a-3cd9-73f8-9215-f0a52a5ae0a0" xlink:to="loc_ifrs-full_BusinessCombinationsAxis_01a1145a-3cd9-721b-97b0-cc342efe735b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_01a1145a-3cd9-721b-97b0-cc342efe735b_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_01a1145a-3cd9-721b-97b0-cc342efe735b" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_01a1145a-3cd9-721b-97b0-cc342efe735b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_01a1145a-3cd9-7c46-8245-3a4a26f1dba2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_01a1145a-3cd9-721b-97b0-cc342efe735b" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_01a1145a-3cd9-7c46-8245-3a4a26f1dba2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_AthabascaOilCorporationMember_01a1145a-3cd9-7b60-936b-3b13432efb6b" xlink:href="cve-20260930.xsd#cve_AthabascaOilCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_01a1145a-3cd9-7c46-8245-3a4a26f1dba2" xlink:to="loc_cve_AthabascaOilCorporationMember_01a1145a-3cd9-7b60-936b-3b13432efb6b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_01a17398-c42f-7559-acc7-6a84348c090c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_01a1145a-3cd9-73f8-9215-f0a52a5ae0a0" xlink:to="loc_srt_RangeAxis_01a17398-c42f-7559-acc7-6a84348c090c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a17398-c42f-7559-acc7-6a84348c090c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_01a17398-c42f-7559-acc7-6a84348c090c" xlink:to="loc_srt_RangeMember_01a17398-c42f-7559-acc7-6a84348c090c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_01a17398-c42f-7d36-adaa-1ba418fec2ff" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_01a17398-c42f-7559-acc7-6a84348c090c" xlink:to="loc_srt_RangeMember_01a17398-c42f-7d36-adaa-1ba418fec2ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_01a17399-2517-7829-8e9c-c6e9793f13f1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_01a17398-c42f-7d36-adaa-1ba418fec2ff" xlink:to="loc_srt_MaximumMember_01a17399-2517-7829-8e9c-c6e9793f13f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashTransferred_01a1145a-3cd9-7e36-b29f-36f99c38e79e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a1145a-3cd9-716b-899f-efe3267a7df6" xlink:to="loc_ifrs-full_CashTransferred_01a1145a-3cd9-7e36-b29f-36f99c38e79e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfSharesIssuedInBusinessCombination_01a1145a-3cd9-71af-8955-8ad9fc5a8b1a" xlink:href="cve-20260930.xsd#cve_NumberOfSharesIssuedInBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a1145a-3cd9-716b-899f-efe3267a7df6" xlink:to="loc_cve_NumberOfSharesIssuedInBusinessCombination_01a1145a-3cd9-71af-8955-8ad9fc5a8b1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_PercentageOfTotalConsiderationTransferred_01a15edc-edb3-7fb3-a794-eef43c68a95b" xlink:href="cve-20260930.xsd#cve_PercentageOfTotalConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a1145a-3cd9-716b-899f-efe3267a7df6" xlink:to="loc_cve_PercentageOfTotalConsiderationTransferred_01a15edc-edb3-7fb3-a794-eef43c68a95b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_PercentageOfConsiderationTransferredInShares_01a15edc-edb3-720e-98ce-ed926472066d" xlink:href="cve-20260930.xsd#cve_PercentageOfConsiderationTransferredInShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a1145a-3cd9-716b-899f-efe3267a7df6" xlink:to="loc_cve_PercentageOfConsiderationTransferredInShares_01a15edc-edb3-720e-98ce-ed926472066d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfVotingEquityInterestsAcquiredShares_01a173aa-a223-77a3-9fda-a2b93ff4a45c" xlink:href="cve-20260930.xsd#cve_NumberOfVotingEquityInterestsAcquiredShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a1145a-3cd9-716b-899f-efe3267a7df6" xlink:to="loc_cve_NumberOfVotingEquityInterestsAcquiredShares_01a173aa-a223-77a3-9fda-a2b93ff4a45c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_cve_NumberOfVotingEquityInterestsAcquiredAmount_01a173aa-a223-7aa2-bed3-16604f51aa6e" xlink:href="cve-20260930.xsd#cve_NumberOfVotingEquityInterestsAcquiredAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_01a1145a-3cd9-716b-899f-efe3267a7df6" xlink:to="loc_cve_NumberOfVotingEquityInterestsAcquiredAmount_01a173aa-a223-7aa2-bed3-16604f51aa6e" xlink:type="arc" order="5"/>
  </link:definitionLink>
</link:linkbase>
