1. keen perception and cleverly apt expression of connections between ideas which may arouse pleasure and especially amusement.
2. speech or writing showing such perception and expression.
3. a person endowed with or noted for such wit.
4. understanding, intelligence, or sagacity: wit enough to come in out of the rain.
5. ( plural ) mental abilities, or powers of intelligent observation, keen perception, ingenious contrivance, etc.: to have one's wits about one.
6. ( plural ) mental faculties, or senses: to lose or regain one's wits.
7. Archaic. mental capacity; reason; intellect.
8. Archaic. a clever or learned person.
9. at one's wits' end or at one's wit's end, at the end of one's powers of knowing, thinking, etc.; utterly at a loss or perplexed.
10. five wits, the five senses, or the perceptions generally.
11. live by one's wits, to gain a livelihood by resourcefulness and quick-wittedness rather than by hard work.
12. out of one's wits, in or into a state of great fear or incoherence: to frighten someone out of their wits.
[ME and OE, c. G Witz, Icel. vit ]