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English definition of “affair”

affair

noun [C] (RELATIONSHIP)    /əˈfeər/ US  /-ˈfer/
B2 a sexual relationship, especially a secret one: She's having an affair with a married man. The book doesn't make any mention of his love affairs. an extramarital affairInfidelity in relationships
(Definition of affair noun (RELATIONSHIP) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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