protagonist: Meaning and Definition of

pro•tag•o•nist

1. the leading character, hero, or heroine of a drama or other literary work.
2. a proponent for or advocate of a political cause, social program, etc.
3. the leader or principal person in a movement, cause, etc.
4. the first actor in ancient Greek drama, who played not only the main role, but also other roles when the main character was offstage. Cf.
5. agonist.