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English definition of “affair”

affair

noun     /əˈfeər/
EVENTS [C] B2 a situation or set of related events, especially bad ones: The government's handling of the affair has been widely criticized.Situations and circumstances
RELATIONSHIP [C] B2 a sexual relationship between two people when one or both of them is married to someone else: He's been having an affair with a woman at work.Infidelity in relationships
be sb's affair If something is your affair, it is private and you do not want anyone else to be involved or know about it. → See also love affairParticular and individual
(Definition of affair noun from the Cambridge Learner's Dictionary © Cambridge University Press)

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