fifteenth

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The ordinal number matching the number 15 in a series.
2. n. One of 15 equal parts.

Century Dictionary and Cyclopedia

1. Next after the fourteenth: an ordinal numeral.
2. n. The quotient of unity divided by fifteen; one of fifteen equal parts of anything: as, eleven fifteenths of an acre.
3. n. In music, the interval or the concord of a double octave.
4. n. In organ-building, a stop whose pipes are tuned two octaves above the keys struck.
5. n. In early English law, a fifteenth part of the rents of the year, or of movables, or both, granted or levied by way of tax. When a fifteenth was the rate for the counties at large, that for towns and demesnes was usually a tenth.

Wiktionary

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

GNU Webster's 1913

1. adj. Next in order after the fourteenth; -- the ordinal of fifteen.
2. adj. Consisting of one of fifteen equal parts or divisions of a thing.
3. n. One of fifteen equal parts or divisions; the quotient of a unit divided by fifteen.
4. n. A species of tax upon personal property formerly laid on towns, boroughs, etc., in England, being one fifteenth part of what the personal property in each town, etc., had been valued at.
5. n. A stop in an organ tuned two octaves above the diaposon.
6. n. An interval consisting of two octaves.

WordNet 3.0

1. n. position 15 in a countable series of things
2. adj. coming next after the fourteenth and just before the sixteenth in position