ninety

noun

nine·​ty ˈnīn-tē How to pronounce ninety (audio)
plural nineties
1
: a number equal to nine times 10 see Table of Numbers
2
nineties plural : the numbers 90 to 99
specifically : the years 90 to 99 in a lifetime or century
She's in her nineties.
ninetieth adjective or noun
ninety adjective
ninety pronoun, plural in construction

Examples of ninety in a Sentence

During the nineties, he was going to college and working part-time.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The over-all effect is like watching a movie that’s supposed to be set in the nineties and spotting a Tesla in the background. Tyler Foggatt, New Yorker, 8 June 2025 The Bobby Prince stuff for the series in the nineties is iconic. Joshua Lamb, Forbes.com, 6 June 2025 Arons’s new book is a celebration of their friendship, but also of New York in the nineties — before cell phones and social media — sharing stories of the pair's madcap adventures launching their handbag and accessories line that also bore Spade's name. Liz McNeil, People.com, 4 June 2025 Can’t imagine many who lived through the nineties wanting it any other way. The Athletic Uk Staff, New York Times, 17 May 2025 See All Example Sentences for ninety

Word History

Etymology

Middle English ninety, adjective, from Old English nigontig, short for hundnigontig, from hundnigontig, noun, group of 90, from hund-, literally, hundred + nigon nine + -tig group of 10; akin to Old English tīen ten

First Known Use

before the 12th century, in the meaning defined at sense 1

Time Traveler
The first known use of ninety was before the 12th century

Cite this Entry

“Ninety.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ninety. Accessed 11 Jun. 2025.

Kids Definition

ninety

noun
nine·​ty ˈnīnt-ē How to pronounce ninety (audio)
plural nineties
1
: a number equal to nine times 10 see number
2
plural : the numbers 90 to 99 and specifically the years 90 to 99 in a lifetime or century
ninetieth adjective or noun
ninety adjective or pronoun

More from Merriam-Webster on ninety

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