American English

Definition of ninety number from the Oxford Advanced American Dictionary



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  1. 1number 90
  2. 2noun the nineties [plural] numbers, years, or temperatures from 90 to 99 The temperature must be in the nineties today.
  3. Idioms
    in your nineties
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    between the ages of 90 and 99
    ninety-nine times out of a hundred
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    almost always
ordinal number, noun There are examples of how to use ordinal numbers at the entry for fifth.
See the Oxford Advanced Learner's Dictionary entry: ninety