Ninety meaning

nīn'tē
The cardinal number equal to 9 × 10.
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Nine times ten.
adjective
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The cardinal number between eighty-nine and ninety-one; 90; XC (or LXXXX)
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the Gay Nineties
  • The decade 1890-99 in the U.S.
idiom
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the nineties
  • The numbers or years, as of a century, from ninety through ninety-nine.
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Idioms and Phrasal Verbs

the Gay Nineties
the nineties

Origin of ninety

  • Middle English ninti from Old English nigontig newn̥ in Indo-European roots
    From American Heritage Dictionary of the English Language, 5th Edition