nine·ty

[nahyn-tee] noun, plural nine·ties, adjective
noun
1.
a cardinal number, ten times nine.
2.
a symbol for this number, as 90 or XC.
3.
a set of this many persons or things.
4.
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
5.
amounting to 90 in number.
00:10
Ninety is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.

Origin:
before 1000; Middle English nineti, Old English nigontig. See nine, -ty1

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World English Dictionary
ninety (ˈnaɪntɪ) [Click for IPA pronunciation guide]
 
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
 
determiner
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
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Etymonline
Word Origin & History

ninety
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 thousand people die as a consequence of the infections they pick up in
  the hospital.
Ninety-nine percent of the tinnitus sufferers said the treatment got rid of the
  disturbing phantom sound.
He can be interviewed by journalists only once every ninety days.
In this hypothetical case, about ninety percent of people agree that it is
  morally permissible to turn the trolley.
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