eleventh

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The ordinal number matching the number 11 in a series.
2. n. One of 11 equal parts.

Century Dictionary and Cyclopedia

1. Next in order after the tenth: an ordinal number.
2. Constituting one of eleven equal parts into which anything is divided: as, the eleventh part of fifty-five is five.
3. n. One of eleven equal parts; the quotient of unity divided by eleven: as, five elevenths of fifty-five are twenty-five.
4. n. In early English law, an eleventh part of the rents of the year, or of movables, or both, granted or levied by way of tax.
5. n. In music: The interval between any tone and a tone on the eleventh diatonic degree above or below it; a compound fourth, or an octave and a fourth.

Wiktionary

1. adj. The ordinal form of number eleven.
2. n. The person or thing in the eleventh position.
3. n. One of eleven equal parts of a whole.

GNU Webster's 1913

1. adj. Next after the tenth.
2. adj. Constituting one of eleven parts into which a thing is divided.
3. adj. (Mus.) 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. (Mus.) The interval consisting of ten conjunct degrees; the interval made up of an octave and a fourth.

WordNet 3.0

1. adj. coming next after the tenth and just before the twelfth in position
2. n. position 11 in a countable series of things