That which is done or is to be done; matter; concern; as, a
difficult affair to manage; business of any kind, commercial,
professional, or public; – often in the plural. “At the head of
affairs.” Junius.

Any proceeding or action which it is wished to refer to or
characterize vaguely; as, an affair of honor, i. e., a duel; an affair
of love, i. e., an intrigue.

An action or engagement not of sufficient magnitude to be
called a battle.

Action; endeavor.

A material object (vaguely designated).