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

before 1100; Middle English nyntithe, Old English nigenteotha. See ninety, -eth2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ninetieth (ˈnaɪntɪɪθ)
1.  (usually prenominal)
 a.  being the ordinal number of ninety in numbering or counting order, position, time, etc. Often written: 90th
 b.  (as noun): the ninetieth in succession
2.  a.  one of 90 approximately equal parts of something
 b.  (as modifier): a ninetieth part
3.  the fraction equal to one divided by 90 (1/90)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
In ideal conditions, the main blossom appears around the ninetieth day from germination.
In this manner did he live from the fortieth or forty-second to the ninetieth year of his age.
Gladys showed me pictures from her ninetieth birthday party, the biggest get-together in the history of the family.
Sick leave accrues monthly and may be used as it accrues starting after the ninetieth day of employment.
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