Definition of forty number from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈfɔːti//
    ; NAmE NAmE//ˈfɔːrti//
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  1. 1  number 40
  2. 2noun the forties [plural] numbers, years or temperatures from 40 to 49
  3. Idioms between the ages of 40 and 49
See the Oxford Advanced American Dictionary entry: forty