affair

noun9

1. •
   [in the plural] Something which is done or is to be done; business of any kind, commercial, professional, or public.

   • Responsibility is my affair, reciprocity is his. — 1992
2. •
   a secret romantic relationship between a married person and someone else

   • When Martin's wife found out about his affair with her best friend, she asked for a divorce.
   • Mary had an affair with a woman from the gym.
3. •
   An otherwise illicit romantic relationship, such as with someone who is not one's regular partner (boyfriend, girlfriend).

   • Jerry's girlfriend said she wanted to go steady, but she was in an affair with one of his team-mates.
4. •
   Any proceeding or action which it is wished to refer to or characterize vaguely.

   • The house was a ramshackle affair.
5. •
   A party or social gathering, especially of a formal nature.
6. •
   A material object (vaguely designated).

   • He used a hook-shaped affair with a long handle to unlock the car.
   • This garden is a ramshackle affair.
7. •
   (informal) A person with whom someone has an adulterous relationship.

   • I was his affair and he was a little boy toy to me... Together it was our little scandal. — 2010
8. •
   An action or engagement not of sufficient magnitude to be called a battle.
9. •
   (slang, no longer used) The (male or female) genitals.