American English

Definition of ninety number from the Oxford Advanced American Dictionary

     

    ninety

     
    NAmE//ˈnaɪnt̮i//
     
     
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  1. 1number 90
  2. 2 noun 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
NAmE//ˈnaɪnt̮iəθ//
 
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