American English

Definition of fifty number from the Oxford Advanced American Dictionary



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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.
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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