1. (a.) Next after the tenth; as, the eleventh chapter.

2. (a.) Constituting one of eleven parts into which a thing is divided; as, the eleventh part of a thing.

3. (a.) of or pertaining to the interval of the octave and the fourth.

4. (n.) The quotient of a unit divided by eleven; one of eleven equal parts.

5. (n.) The interval consisting of ten conjunct degrees; the interval made up of an octave and a fourth.