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thirteenth

[thur-teenth]
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adjective
  1. next after the twelfth; being the ordinal number for 13.
  2. being one of 13 equal parts.
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noun
  1. a thirteenth part, especially of one (1/13).
  2. the thirteenth member of a series.
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Origin of thirteenth

before 900; thirteen + -th2; replacing Middle English thrittenthe (see three, tenth), Old English thryttēotha (see tithe)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for thirteenth

thirteenth

adjective
  1. (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
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noun
    1. one of 13 equal or nearly equal parts of something
    2. (as modifier)a thirteenth part
  1. the fraction equal to one divided by 13 (1/13)
  2. music
    1. an interval of one octave plus a sixthSee also interval (def. 5)
    2. short for thirteenth chord
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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

Word Origin and History for thirteenth

adj.

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.

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Online Etymology Dictionary, © 2010 Douglas Harper