affairaffairaffairsnoun1(pluralaffairs) something that happens; an event: The wedding was a very quiet affair.2affairs (plural) important events and situations: the minister for foreign affairsWe talked about current affairs (= the political and social events that are happening at the present time)3(no plural) something private that you do not want other people to know about: What happened between us is my affair. I don't want to talk about it.4(pluralaffairs) a sexual relationship between two people, usually one that is secret: Her husband was having an affair.