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[nahyn-tee] /ˈnaɪn ti/
noun, plural nineties.
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.
amounting to 90 in number.
Origin of ninety
before 1000; Middle English nineti, Old English nigontig. See nine, -ty1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for ninety
Contemporary Examples
Historical Examples
  • It can hope for no success until ninety million people know what it is.

    Adventures in the Arts Marsden Hartley
  • "Nineteen hundred and ninety," I added, when I had finished the count.

    Up the River Oliver Optic
  • I imagined you a hundred per center, and I found you only a ninety per center.

    Swirling Waters Max Rittenberg
  • On it the wizard had placed his fortune of ninety millions of dollars.

    The Root of Evil Thomas Dixon
  • In the afternoon more sailing canoes arrived, some of which contained not less than ninety passengers.

British Dictionary definitions for ninety


noun (pl) -ties
the cardinal number that is the product of ten and nine See also number (sense 1)
a numeral, 90, XC, etc, representing this number
something represented by, representing, or consisting of 90 units
  1. amounting to ninety: ninety times out of a hundred
  2. (as pronoun): at least ninety are thought to be missing
Word Origin
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
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Word Origin and History for ninety

Old English nigontig, from nine + -tig "group of ten" (see -ty (1)). Cognate with Old Frisian niontich, Middle Dutch negentich, Dutch negentig, German neunzig.

Online Etymology Dictionary, © 2010 Douglas Harper
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