Eleventh

1. n. The interval consisting of ten conjunct degrees; the interval made up of an octave and a fourth.
2. a. Next after the tenth; as, the eleventh chapter.
3. a. Constituting one of eleven parts into which a thing is divided; as, the eleventh part of a thing.
4. a. Of or pertaining to the interval of the octave and the fourth.
5. n. The quotient of a unit divided by eleven; one of eleven equal parts.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.