Definition of seventy number from the Oxford Advanced American Dictionary

     

    seventy

     
    NAmE//ˈsɛvnt̮i//
     
     
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  1. 1number 70
  2. 2noun the seventies [plural] numbers, years, or temperatures from 70 to 79
  3. Idioms
    in your seventies
     
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    between the ages of 70 and 79
NAmE//ˈsɛvnt̮iəθ//
 
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: seventy