fiftieth

[fif-tee-ith]
noun
  1. a fiftieth part, especially of one (1/50).
  2. the fiftieth member of a series.

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

fiftieth

adjective
    1. being the ordinal number of fifty in order, position, time, etc. Often written: 50th
    2. (as noun)the fiftieth in the series
noun
    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)
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
adj.

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.

Online Etymology Dictionary, © 2010 Douglas Harper