Definition of ninety in English:

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Pronunciation: /ˈnīn(t)ē/

noun (plural nineties)

1Equivalent to the product of nine and ten; ten less than one hundred; 90: ninety acres of soybeans will be harvested (Roman numeral: xc or XC)
More example sentences
  • The ninety to one hundred campers in the study were selected by the camp directors and were, for the most part, return campers.
  • This couple had nine children, and ninety grandchildren, so to write about them all has been a mammoth undertaking.
  • By the way, ninety to a hundred years ago, this was the first stop for a variety of immigrants.
1.1 (nineties) The numbers from 90 to 99, especially the years of a century or of a person’s life: art in the nineties
More example sentences
  • He survived to a great age, well into his nineties, and remained a powerful personality to the end.
  • Skin disease sufferers can be any age, from babies to patients in their nineties.
  • I've had plenty of years of practice dancing round my kitchen and I used to get drunk quite regularly in the mid nineties.
1.2Ninety years old: she is nearly ninety
More example sentences
  • In fact, he refused to be kept from painting ceaselessly until he died at the age of nearly ninety in 1849.
  • A man who is nearly ninety said to me recently that he always found that the poor during the depression were more generous with the little they had than those who were better off.
  • At nearly ninety he continues his research and his writing and is a regular visitor to the New Zealand room at the Canterbury Public Library.
1.3Ninety miles an hour: we passed the junction doing about ninety
More example sentences
  • She sped up, hitting eighty, then ninety, gaining distance the entire time.



Pronunciation: /ˈnīn(t)ēəTH/
ordinal number
Example sentences
  • I was sitting in this [sloped] chair in my living room on my ninetieth birthday, and I started crying as I recalled my father going swimming at Coney Island, and a poem came out.
  • Then in the ninetieth minute Clonaslee were awarded their second penalty of the game and this time Eamon McEvoy took it by the but Celtics Danny Fitzpatrick made a great save.
  • The West Wing ranks ninetieth, two spots ahead of 60 Minutes.


Pronunciation: /-ˌfōld/
adjective& adverb
Example sentences
  • It was not, however, anywhere near the official statistic which claimed a ninetyfold increase in this period.
  • That way, you can tell at a glance that Coke's shares haven't fallen from $72 to $50 since 1970, but instead have risen from the equivalent of 55 cents to $50-a ninetyfold increase.
  • Every situation is different, but we do know that Jesus will act like the sun, shining on our work and making it grow and bear fruit-perhaps even thirty or sixty or ninetyfold.


Old English nigontig.

For editors and proofreaders

Syllabification: nine·ty

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