Meanings
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1
noun
Unfaithfulness in a marriage or an intimate (sexual or romantic) relationship: practice or instance of having a sexual or romantic affair with someone other than one's spouse, without the consent of the spouse.
Your friends tell you rumors about your girlfriend's infidelity or you remember being broken up around the time the baby was conceived.
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Thesaurus
From Middle English infidelite, from Middle French infidelité (modern French infidélité) and its etymon Latin īnfidēlitās. Equivalent to infidel + -ity.