ninety

[ nahyn-tee ]
/ ˈnaɪn ti /

noun, plural nine·ties.

a cardinal number, ten times nine.
a symbol for this number, as 90 or XC.
a set of this many persons or things.
nineties, the numbers, years, degrees, or the like, from 90 through 99, as in referring to numbered streets, indicating the years of a lifetime or of a century, or degrees of temperature: His grandmother is in her nineties.

adjective

amounting to 90 in number.

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Origin of ninety

before 1000; Middle English nineti, Old English nigontig. See nine, -ty1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for nineties

British Dictionary definitions for nineties

ninety
/ (ˈnaɪntɪ) /

noun plural -ties

the cardinal number that is the product of ten and nineSee also number (def. 1)
a numeral, 90, XC, etc, representing this number
something represented by, representing, or consisting of 90 units

determiner

  1. amounting to ninetyninety times out of a hundred
  2. (as pronoun)at least ninety are thought to be missing

Word Origin for ninety

Old English nigontig
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012