'Protagonist' definitions:

Definition of 'protagonist'

(from WordNet)
noun
A person who backs a politician or a team etc.; "all their supporters came out for the game"; "they are friends of the library" [syn: supporter, protagonist, champion, admirer, booster, friend]
noun
The principal character in a work of fiction [syn: protagonist, agonist]

Definition of 'Protagonist'

From: GCIDE
  • Protagonist \Pro*tag"o*nist\, n. [Gr. prwtagonisth`s; prw^tos first + 'agonisth`s an actor, combatant, fr. 'agw`n a contest.] One who takes the leading part in a drama; hence, one who takes lead in some great scene, enterprise, conflict, or the like. [1913 Webster]
  • Shakespeare, the protagonist on the great of modern poetry. --De Quincey. [1913 Webster]