from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The ordinal number matching the number 90 in a series.
  • n. One of 90 equal parts.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. The ordinal form of the number ninety.
  • n. The person or thing in the ninetieth position.
  • n. One of ninety equal parts of a whole.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Next in order after the eighty-ninth.
  • adj. Constituting or being one of ninety equal parts.
  • n. The quotient of a unit divided by ninety; one of ninety equal parts of anything.
  • n. The next in order after the eighty-ninth.

from The Century Dictionary and Cyclopedia

  • Next in order or rank after the eighty-ninth or before the ninety-first: an ordinal numeral: as, the ninetieth man.
  • Being one of ninety: as, a ninetieth part.
  • n. A ninetieth part; the quotient of unity divided by ninety: as, two ninetieths.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. position 90 in a countable series of things
  • adj. the ordinal number of ninety in counting order


Sorry, no etymologies found.


  • In April 2010, shortly before his ninetieth birthday, Stevens announced his resignation after thirty-five years on the Supreme Court.

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  • Sitting in the airport before a television screen, I watch Nelson Mandela take the stage at his ninetieth birthday celebration.

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  • “Besides, your ninetieth wedding anniversary only comes around once.”

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  • At some point following the Diamond Jubilee in 2012—perhaps upon her own ninetieth birthday in 2016—she would agree to step aside allowing Charles to become king at last at age sixty-seven—still making him the oldest person ever to assume the throne, although at an age when he might still leave his mark on history.

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  • Coincidentally, Prince Philip would be celebrating his ninetieth birthday on June 10, 2011.

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  • Approaching her ninetieth birthday, she felt that the job had aged her, that it had scooped her up and carried her summarily past her middle years—well, her late middle years.

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  • The other celebrated his ninetieth birthday this month standing O for him, still playing with a full deck and blessed with more marbles than anyone else in the game.

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  • At the start of the month I mentioned Sterling's contest for Richard Scarry books, celebrating his ninetieth birthday this month.

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  • She looked at him, like she was seeing him for the first time, for the thirty seventh, the ninetieth, the four thousandth time, as she heard her own words spread from his lips.

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  • Never mind that he had his ninetieth birthday in 2006, he had kept this work to himself for almost seven months and when he arrived, he was overflowing.

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