An affair is usually a euphemism for a situation where two people are involved in an illicit activity. It is usually a romantic relationship commonly of limited duration. In lieu of this context, it can also be used to describe a meeting or some sort of business that a person must take care of. For example, one might say, "I have other affairs to attend to at the moment." It may also refer to a business run by a family, as in family affair. Notable family affair is the filmmaking business within Japan's Tsuburaya family, and the superhero business within the fictional Incredible Family.
The term usually implies sexual impropriety, but it is not necessarily the case. (For example, in the classic film An Affair to Remember, the love affair in question is generally considered acceptable from a moral standpoint.)
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