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



    BrE BrE//ˈθɜːti//
    ; NAmE NAmE//ˈθɜːrti//
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  1. 1  number 30
  2. 2noun the thirties [plural] numbers, years or temperatures from 30 to 39
  3. Idioms between the ages of 30 and 39
See the Oxford Advanced American Dictionary entry: thirty