American English

Definition of thirty number from the Oxford Advanced American Dictionary



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  1. 1number 30
  2. 2noun the thirties [plural] numbers, years, or temperatures from 30 to 39
  3. Idioms
    in your thirties
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    between the ages of 30 and 39
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: thirty