—adj. 1. differing in nature from what is ordinary, usual, or expected: an odd choice. 2. singular or peculiar in a strange or eccentric way: an odd person; odd manners. 3. fantastic; bizarre: Her taste in clothing was rather odd. 4. leaving a remainder of 1 when divided by 2, as a number (opposed to even): Numbers like 3, 15, and 181 are odd numbers. 5. more or less, esp. a little more (used in combination with a round number): I owe three hundred-odd dollars. 6. being a small amount in addition to what is counted or specified: I have five gross and a few odd dozens. 7. being part of a pair, set, or series of which the rest is lacking: an odd glove. 8. remaining after all others are paired, grouped, or divided into equal numbers or parts: Everybody gets two hamburgers and I get the odd one. 9. left over after all others are used, consumed, etc.
10. (of a pair) not matching: Do you know you're wearing an odd pair of socks? 11. not forming part of any particular group, set, or class: to pick up odd bits of information. 12. not regular, usual, or full-time; occasional; casual: odd jobs. 13. out-of-the-way; secluded: a tour to the odd parts of the Far East. 14. Math.(of a function) having a sign that changes when the sign of each independent variable is changed at the same time.

—n. 1. something that is odd.
2. Golf. a. a stroke more than the opponent has played.
b. Brit.a stroke taken from a player's total score for a hole in order to give him or her odds.