Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A person 90 years old or between 90 and 100 years old.

from The Century Dictionary.

  • Containing or pertaining to ninety.
  • noun A person who is ninety years old.

from the GNU version of the Collaborative International Dictionary of English.

  • noun A person ninety years old.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun One who is between the age of 90 and 99, inclusive. One who is in his or her tenth decade.
  • adjective Being between the age of 90 and 99, inclusive. In one's tenth decade.
  • adjective Of or relating to a nonagenarian.

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

  • noun someone whose age is in the nineties
  • adjective being from 90 to 99 years old

Etymologies

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

[From Latin nōnāgēnārius, from nōnāgēnī, ninety each, from nōnāgintā, ninety : nōnus, ninth; see nona– + -gintā, ten times; see dekm̥ in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin nōnāgēnārius ("of the number ninety") (from nonageni ("ninety each"), from nonaginta ("ninety"), from nona- (akin to novem ("nine")) + -ginta (akin to viginti ("twenty")), + -arius) +‎ -an

Examples

  • Last year however, we had two summer trips that were genealogical, starting with a family reunion where four generations of Italian-Americans rallied around our nonagenarian patriarch, my great uncle John Balma.

    Dr. Caroline Cicero: Crossing The Seas To Make A Legacy

  • Last year however, we had two summer trips that were genealogical, starting with a family reunion where four generations of Italian-Americans rallied around our nonagenarian patriarch, my great uncle John Balma.

    Dr. Caroline Cicero: Crossing The Seas To Make A Legacy

  • Ms. Kaplan, a fashionable nonagenarian, said she avoided the club in its heyday.

    Studio 54 Reopens—For Just One Night

  • Last year however, we had two summer trips that were genealogical, starting with a family reunion where four generations of Italian-Americans rallied around our nonagenarian patriarch, my great uncle John Balma.

    Dr. Caroline Cicero: Crossing The Seas To Make A Legacy

  • She laughed she had a great sense of humor for an nonagenarian and she sometimes cackled for many minutes which felt like serious overkill but it was like her laugh switch had been turned on and there was no OFF.

    Marigold

  • "Oracle" and "Seventy-Two Letters" were both on the Hugo shortlist for Best Novella, but were beaten by Jack Williamson's "The Ultimate Earth", which is not as good a story as either but was obviously the last chance to give an award to the nonagenarian author (it won the Nebula too, I guess for the same reason).

    Gibbon VII

  • Or, if you're a Californian nonagenarian with an ambitious wife, you can buy the whole magazine for $1 (plus taking on $47m in debts).

    Newsweek: yours for a dollar. But it's hardly a bargain

  • Brown's ambition for the project is not in doubt – she has confirmed rumours of discussions between billionaire Barry Diller, the backer for her own online publication, the Daily Beast, and Newsweek's nonagenarian proprietor, Sidney Harman.

    Tina Brown's Daily Beast bids for Newsweek – and a showdown with the Huffington Post

  • Becoming a nonagenarian isn't unthinkable: One in four of today's 65-year-olds will live to 90, and one in 10 to age 95.

    Don't Join the Ostrich Generation

  • Last year however, we had two summer trips that were genealogical, starting with a family reunion where four generations of Italian-Americans rallied around our nonagenarian patriarch, my great uncle John Balma.

    Dr. Caroline Cicero: Crossing The Seas To Make A Legacy

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