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affair

noun [C] (RELATIONSHIP)
 
 
/əˈfeər/ US  /-ˈfer/

Definition

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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