American English

Definition of forty number from the Oxford Advanced American Dictionary



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  1. 1number 40
  2. 2noun the forties [plural] numbers, years, or temperatures from 40 to 49
  3. Idioms
    in your forties
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    between the ages of 40 and 49
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: forty