1. (a.) Next in order after the eleventh; coming after eleven others; -- the ordinal of twelve.

2. (a.) Consisting, or being one of, twelve equal parts into which anything is divided.

3. (n.) The quotient of a unit divided by twelve; one of twelve equal parts of one whole.

4. (n.) The next in order after the eleventh.

5. (n.) An interval comprising an octave and a fifth.