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  1. next after the eighty-ninth; being the ordinal number for 90.
  2. being one of 90 equal parts.
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  1. a ninetieth part, especially of one (1/90).
  2. the ninetieth member of a series.
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Origin of ninetieth

before 1100; Middle English nyntithe, Old English nigenteotha. See ninety, -eth2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for ninetieth


  1. (usually prenominal)
    1. being the ordinal number of ninety in numbering or counting order, position, time, etc. Often written: 90th
    2. (as noun)the ninetieth in succession
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    1. one of 90 approximately equal parts of something
    2. (as modifier)a ninetieth part
  1. the fraction equal to one divided by 90 (1/90)
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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 ninetieth

late 14c., nyntithe; see ninety + -th (1). Replaced Old English nigenteoþan.

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Online Etymology Dictionary, © 2010 Douglas Harper