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ninetieth

[ nahyn-tee-ith ]
/ ˈnaɪn ti ɪθ /
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adjective

next after the eighty-ninth; being the ordinal number for 90.
being one of 90 equal parts.

noun

a ninetieth part, especially of one (1/90).
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. 2021

British Dictionary definitions for ninetieth

ninetieth
/ (ˈnaɪntɪɪθ) /

adjective

(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

noun

  1. one of 90 approximately equal parts of something
  2. (as modifier)a ninetieth part
the fraction equal to one divided by 90 (1/90)
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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