Etymology

Noun

1. The act or practice of abstaining, refraining from indulging a desire.

   The abstinence from a present pleasure that offers itself is a pain, nay, oftentimes, a very great one. — John Locke

   Complete abstinence is easier than perfect moderation. — S^t Augustine

2. Specifically, the practice of abstaining from intoxicating/alcoholic beverages (also called total abstinence, teetotalism).
3. Specifically, the practice of abstaining from sexual intercourse, either permanently or until marriage.
4. The practice of self-denial by depriving one's self (partly or totally) of certain kinds of food or drink, especially meat.

   Penance, fasts, and abstinence, / To punish bodies for the soul's offense. - John Dryden