Definition of extra- prefix from the Oxford Advanced American Dictionary

     

    extra-

     prefix
    prefix
    NAmE//ˈɛkstrə//
     
     
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  1. 1(in adjectives)
  2. 2outside; beyond extramarital sex extraterrestrial beings
  3. 3(informal) very; more than usual extra-thin extra-special
See the Oxford Advanced Learner's Dictionary entry: extra-