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[nahyn-tee-ith] /ˈnaɪn ti ɪθ/
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.
Origin of ninetieth
before 1100; Middle English nyntithe, Old English nigenteotha. See ninety, -eth2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for ninetieth
Contemporary Examples
Historical Examples
  • He died in his ninetieth year; not from any disease, but the mere weakness of old age.

    The Freedmen's Book Lydia Maria Child
  • The colonel of the ninetieth Rhode Island fell at twenty-two.

    Special Messenger Robert W. Chambers
  • The pupils of reformatories should never make heads of pins or the ninetieth fraction of a shoe.

  • In full-front view he did not look like a man in his ninetieth year.

    In and Around Berlin Minerva Brace Norton
  • They had gathered on invitation in order to participate in honoring President Woodruff on the ninetieth anniversary of his birth.

    Wilford Woodruff Matthias F. Cowley
  • Theophrastus began his "Character of Man" on his ninetieth birthday.

    Genius in Sunshine and Shadow Maturin Murray Ballou
  • It will break my heart if Sidney dies now, for I had so looked forward to celebrating his ninetieth birthday with him.

    Once a Week Alan Alexander Milne
  • He began it in his fortieth year, and did not finish it until his ninetieth .

  • Here most of the One Hundred and ninetieth, and some from other regiments, rallied and faced the enemy.

    In The Ranks R. E. McBride
British Dictionary definitions for ninetieth


(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
  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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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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