affair

(noun): (often in the plural) Something which is done or is to be done; business of any kind, commercial, professional, or public.
(noun): Any proceeding or action which it is wished to refer to or characterize vaguely.
(noun): 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).
(noun): A romantic relationship with someone who is not one's regular partner (boyfriend, girlfriend).
(noun): A person with whom someone has an adulterous relationship.
(noun): A party or social gathering, especially of a formal nature.
(noun): The (male or female) genitals.