American English

Definition of forty number from the Oxford Advanced American Dictionary

     

    forty

     
    NAmE//ˈfɔrt̮i//
     
     
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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
NAmE//ˈfɔrt̮iəθ//
 
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