meaning of fifteenth
1. Next in order after the fourteenth; -- the ordinal of fifteen.
2. Consisting of one of fifteen equal parts or divisions of a thing.
3. One of fifteen equal parts or divisions; the quotient of a unit divided by fifteen.
4. 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. A stop in an organ tuned two octaves above the diaposon.
6. An interval consisting of two octaves.