Definition of fifty number from the Oxford Advanced American Dictionary

     

    fifty

     
    NAmE//ˈfɪfti//
     
     
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  1. 1number 50
  2. 2noun the fifties [plural] numbers, years, or temperatures from 50 to 59 She was born in the fifties.
  3. Idioms
    in your fifties
     
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    between the ages of 50 and 59 He retired when he was in his fifties.
NAmE//ˈfɪftiəθ//
 
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: fifty

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