'affair' definitions:

Definition of 'affair'

From: WordNet
noun
A vaguely specified concern; "several matters to attend to"; "it is none of your affair"; "things are going well" [syn: matter, affair, thing]
noun
A usually secretive or illicit sexual relationship [syn: affair, affaire, intimacy, liaison, involvement, amour]
noun
A vaguely specified social event; "the party was quite an affair"; "an occasion arranged to honor the president"; "a seemingly endless round of social functions" [syn: affair, occasion, social occasion, function, social function]

Synonyms of 'affair'

From: Moby Thesaurus