- Noun. That which is done or is to be done; matter; concern; business of any kind, commercial, professional, or public; — often in the plural.
- Noun. Any proceeding or action which it is wished to refer to or characterize vaguely.
- Noun. (military) An action or engagement not of sufficient magnitude to be called a battle.
- Noun. A material object (vaguely designated).
- Noun. An adulterous relationship. (from ''affaire de cœur''.).