• Fifteen Definition & Synonyms

  1. (n.) A symbol representing fifteen units, as 15, or xv.
  2. (n.) The sum of five and ten; fifteen units or objects.
  3. (a.) Five and ten; one more than fourteen.

• Fifteenth Definition & Synonyms

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