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[fif-teenth] /ˈfɪfˈtinθ/
next after the fourteenth; being the ordinal number for 15.
being one of 15 equal parts.
a fifteenth part, especially of one (1/15).
the fifteenth member of a series.
Music. the interval of two octaves.
Origin of fifteenth
before 900; Middle English fiftenthe (see fifteen, -th2); replacing Middle English fiftethe, Old English fīftēotha Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for fifteenth
  • He was burned at the stake in the fifteenth century for heresy.
  • It was invented at the command of a fifteenth-century king.
  • At the time, scientists were split between two explanations for sudden appearance of syphilis at the end of the fifteenth century.
  • There are some nuclear particles that only show up once in ten to the fifteenth power number of particle interactions.
  • Otherwise, your arguments are weaker than the fifteenth cup of tea made from the same teabag.
  • Literacy was already widely-disseminated in the fifteenth century.
  • So, too, did the economic expansion and urbanization that got under way in the fifteenth century.
  • Guests visit monuments, houses, churches and more that date back to the fifteenth century.
  • In his time machine, he's more likely to travel to the fifteenth century than to the twenty-seventh.
  • The wide-ranging festival's fifteenth anniversary brings nearly two hundred companies to twenty downtown venues.
British Dictionary definitions for fifteenth


  1. coming after the fourteenth in order, position, time, etc. Often written: 15th
  2. (as noun): the fifteenth of the month
  1. one of 15 equal or nearly equal parts of something
  2. (as modifier): a fifteenth part
the fraction equal to one divided by 15 (1/15)
  1. an interval of two octaves
  2. one of two notes constituting such an interval in relation to the other, esp the one higher in pitch
  3. 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
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Word Origin and History for fifteenth

late 14c., from fifteen + -th (1). By 15c. displacing forms derived from Old English fifteoða. Cf. Old Frisian fiftuda, Dutch vijftiende, German fünfzehnte, Old Norse fimmtandi, Gothic fimftataihunda.

Online Etymology Dictionary, © 2010 Douglas Harper
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