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[thur-teenth] /ˈθɜrˈtinθ/
next after the twelfth; being the ordinal number for 13.
being one of 13 equal parts.
a thirteenth part, especially of one (1/13).
the thirteenth member of a series.
Origin of thirteenth
before 900; thirteen + -th2; replacing Middle English thrittenthe (see three, tenth), Old English thryttēotha (see tithe) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for thirteenth
Contemporary Examples
Historical Examples
  • The next great name in thirteenth century surgery, for we are not yet out of that fruitful period, is Henri de Mondeville.

    The Popes and Science James J. Walsh
  • Lastly, the thirteenth is that of Walnuts, and it is added to compleat the year.

    The History of Louisiana Le Page Du Pratz
  • After some days the ogre told him again to put out his finger, and thirteenth stuck out a spindle.

    Italian Popular Tales Thomas Frederick Crane
  • It was Sunday, November the thirteenth, and five o'clock in the afternoon.

    A Nest of Spies Pierre Souvestre
  • The family came to Ireland in the thirteenth century, and flourished there till the middle of the seventeenth.

    On an Irish Jaunting-car Samuel G. Bayne
British Dictionary definitions for thirteenth


(usually prenominal)
  1. coming after the twelfth in numbering or counting order, position, time, etc; being the ordinal number of thirteen: often written 13th
  2. (as noun): Friday the thirteenth
  1. one of 13 equal or nearly equal parts of something
  2. (as modifier): a thirteenth part
the fraction equal to one divided by 13 (1/13)
  1. an interval of one octave plus a sixth See also interval (sense 5)
  2. short for thirteenth chord
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
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Word Origin and History for thirteenth

early 14c., þriteenþe, from thirteen + -th (1), replacing forms from Old English þteoteoða. Cf. Old Norse þrettande, Danish trettende, Swedish trettonde, Old Frisian threttinde, Dutch dertiende, Old High German dritto-zehanto, German dreizehnte.

Online Etymology Dictionary, © 2010 Douglas Harper
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