Definition of protagonist noun from the Oxford Advanced American Dictionary

     

    protagonist

     noun
    noun
    NAmE//proʊˈtæɡənɪst//
     
    (formal)
     
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  1. 1 the main character in a play, movie, or book compare hero
  2. 2one of the main people in a real event, especially a competition, battle, or struggle
  3. 3an active supporter of a policy or movement, especially one that is trying to change something synonym champion a leading protagonist of the conservation movement
See the Oxford Advanced Learner's Dictionary entry: protagonist