\Fif"teenth`\, a. [OE. fiftenthe; cf. fiftethe, AS.
f[=i]fte[=o][eth]a. See {Fifteen}.]
1. Next in order after the fourteenth; -- the ordinal of
   fifteen.
2. Consisting of one of fifteen equal parts or divisions of a
   thing.

\Fif"teenth`\, n.
1. One of fifteen equal parts or divisions; the quotient of a
   unit divided by fifteen.
2. 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. --Burrill.
3. (Mus.)
   (a) A stop in an organ tuned two octaves above the
       diaposon.
   (b) An interval consisting of two octaves.