affair

noun

1. 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. 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. 3

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

4. 4

   A material object (vaguely designated).

   “He used a hook-shaped affair with a long handle to unlock the car.”

5. 5

   An adulterous relationship. (from affaire de cœur).

6. 6

   A romantic relationship with someone who is not one's regular partner (boyfriend, girlfriend).

7. 7

   A person with whom someone has an adulterous relationship.

8. 8

   A party or social gathering, especially of a formal nature.

9. 9

   The (male or female) genitals.