Definitions

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

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

  • n. A person ninety years old.

from The Century Dictionary and Cyclopedia

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

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

  • n. someone whose age is in the nineties
  • adj. being from 90 to 99 years old

Etymologies

From Latin nōnāgēnārius, from nōnāgēnī, ninety each, from nōnāgintā, ninety : nōnus, ninth; see nona- + -gintā, ten times; see dekm̥ in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
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 (Wiktionary)

Examples

  • 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

  • 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

  • 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

  • "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

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

    Studio 54 Reopens—For Just One Night

  • 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

  • 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

  • Another woman inquired about how long her nonagenarian grandmother would live.

    Susan M. Kirschbaum: Obama Ate With Harvey in the West Village... But His Fate Was Sealed on the Bowery

  • The post-communist Russian government has kept up the accolades — the nonagenarian Mr. Kalashikov is now a lieutenant general — and Mr. Chivers received little cooperation in his search for authoritative information on the development of the AK-47.

    Everyman

  • What was a great gag when he was, say, 50 years old, and then to STILL be delivering a line like that at the age of 93, as he did on my UK television series, well that existential tension is what made his nonagenarian performances so incredibly spell-binding.

    Boing Boing

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