Definition of twenty number from the Oxford Advanced American Dictionary

     

    twenty

     
    NAmE//ˈtwɛnti//
     
    , NAmE//ˈtwɛni//
     
    , NAmE//ˈtwʌni//
     
     
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  1. 1number 20
  2. 2 noun the twenties [plural] numbers, years, or temperatures from 20 to 29
  3. Idioms
    in your twenties
     
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    between the ages of 20 and 29
NAmE//ˈtwɛntiəθ//
 
, NAmE//ˈtwɛniəθ//
 
, NAmE//ˈtwʌniəθ//
 
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: twenty