n. Anything done or to be done; that which requires action or effort; a moving interest; business; concern: as, this is an affair of great moment; a man of affairs; affairs of state.n. plural Matters of interest or concern; particular doings or interests; specifically, pecuniary interests or relations: as, to meddle with a neighbor's affairs; his affairs are in an embarrassed state.n. An event or a performance; a particular action, operation, or proceeding; military, a partial or minor engagement or contest; a skirmish: as, when did this affair happen: an affair of honor, or of outposts.n. A private or personal concern; a special function, business, or duty.n. Thing; matter; concern: applied to anything made or existing, with a descriptive or qualifying term: as, this machine is a complicated affair; his anger is an affair of no consequence.n. Endeavor; attempt.