Definition of ninety number from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈnaɪnti//
    ; NAmE NAmE//ˈnaɪnti//
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  1. 1  number 90
  2. 2noun the nineties [plural] numbers, years or temperatures from 90 to 99 The temperature must be in the nineties today.
  3. Idioms between the ages of 90 and 99
    ninety-nine times out of a hundred
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    almost always
See the Oxford Advanced American Dictionary entry: ninety