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ninetieth

[nahyn-tee-ith] /ˈnaɪn ti ɪθ/
adjective
1.
next after the eighty-ninth; being the ordinal number for 90.
2.
being one of 90 equal parts.
noun
3.
a ninetieth part, especially of one (1/90).
4.
the ninetieth member of a series.
Origin of ninetieth
1100
before 1100; Middle English nyntithe, Old English nigenteotha. See ninety, -eth2
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for ninetieth

ninetieth

/ˈnaɪntɪɪθ/
adjective
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
noun
2.
  1. one of 90 approximately equal parts of something
  2. (as modifier): a ninetieth part
3.
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
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Word Origin and History for ninetieth

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

Online Etymology Dictionary, © 2010 Douglas Harper
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12
13
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