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.

before 1000; Middle English nineti, Old English nigontig. See nine, -ty1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ninety (ˈnaɪntɪ)
n , pl -ties
1.  See also number the cardinal number that is the product of ten and nine
2.  a numeral, 90, XC, etc, representing this number
3.  something represented by, representing, or consisting of 90 units
4.  a.  amounting to ninety: ninety times out of a hundred
 b.  (as pronoun): at least ninety are thought to be missing
[Old English nigontig]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. nigontig, from nine (q.v.) + -tig "group of ten" (see -ty (1)).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Ninety percent did not wear hearing protection during ensemble performances.
Ninety percent of all hurricane deaths result from storm surges.
Ninety thousand people die as a consequence of the infections they pick up in
  the hospital.
Ninety percent said they'd had no handouts to turn down, while a couple
  declined to comment.
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