Webster's English Dictionary

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protagonist

pro.tag.o.nist \pro--'tag-*-n*st\ n [Gk pro-tago-niste-s, fr. pro-t- prot- 
   + ago-nist]e-s competitor at games, actor, fr. ago-nizesthai to compete, 
   fr. ago-n contest, competition at games - more at AGONY 1: one who takes 
   the leading part in a drama, novel, or story  2: the leader of a cause : 
   CHAMPION  3: a muscle that by its contraction actually causes a particular 
   movement