Main Entry: pro·tag·o·nist

Pronunciation: \prō-ˈta-gə-nist\

Function: noun

Etymology: Greek prōtagōnistēs, from prōt- prot- + agōnistēs competitor at games, actor, from agōnizesthai to compete, from agōn contest, competition at games — more at agony

Date: 1671

1 a : the principal character in a literary work (as a drama or story) b : a leading actor, character, or participant in a literary work or real event
2 : a leader, proponent, or supporter of a cause : champion