[ fif-teenth ]

  1. next after the fourteenth; being the ordinal number for 15.

  2. being one of 15 equal parts.

  1. a fifteenth part, especially of one (1/15).

  2. the fifteenth member of a series.

  1. Music. the interval of two octaves.

Origin of fifteenth

before 900; Middle English fiftenthe (see fifteen, -th2); replacing Middle English fiftethe,Old English fīftēotha

Words Nearby fifteenth Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use fifteenth in a sentence

British Dictionary definitions for fifteenth


/ (ˈfɪfˈtiːnθ) /

    • coming after the fourteenth in order, position, time, etc. Often written: 15th

    • (as noun): the fifteenth of the month

    • one of 15 equal or nearly equal parts of something

    • (as modifier): a fifteenth part

  1. the fraction equal to one divided by 15 (1/15)

    • an interval of two octaves

    • one of two notes constituting such an interval in relation to the other, esp the one higher in pitch

    • an organ stop of diapason quality sounding a note two octaves higher than that normally produced by the key depressed; a two-foot stop

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012