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  1. next after the forty-ninth; being the ordinal number for 50.
  2. being one of 50 equal parts.
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  1. a fiftieth part, especially of one (1/50).
  2. the fiftieth member of a series.
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Origin of fiftieth

before 1000; Middle English fiftithe, Old English fīftigotha. See fifty, -th2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for fiftieth


    1. being the ordinal number of fifty in order, position, time, etc. Often written: 50th
    2. (as noun)the fiftieth in the series
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    1. one of 50 equal or approximately equal parts of something
    2. (as modifier)a fiftieth part
  1. the fraction equal to one divided by 50 (1/50)
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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 fiftieth


Old English fiftigoða; see fifty + -th (1). Cf. Old Norse fimmtugande, and, with a different suffix, Old Frisian fiftichsta, Dutch vijftigste, Old High German fimfzugsto, German fünfzigste.

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Online Etymology Dictionary, © 2010 Douglas Harper