affair

noun

1. (often in the plural) Something which is done or is to be done; business of any kind, commercial, professional, or public.“a difficult affair to manage”
2. Any proceeding or action which it is wished to refer to or characterize vaguely.“an affair of honor, a duel;  an affair of love, an intrigue”
3. An action or engagement not of sufficient magnitude to be called a battle.
4. A material object (vaguely designated).“He used a hook-shaped affair with a long handle to unlock the car.”