The American Heritage® Dictionary of the English Language, 4th Edition
n. The main character in a drama or other literary work.
n. In ancient Greek drama, the first actor to engage in dialogue with the chorus, in later dramas playing the main character and some minor characters as well.
n. The main character in a any story, such as a literary work or drama.
n. A leading person in a contest; a principal performer.
n. An advocate or champion of a cause or course of action.
the GNU version of the Collaborative International Dictionary of English
n. One who takes the leading part in a drama; hence, one who takes lead in some great scene, enterprise, conflict, or the like.
The Century Dictionary and Cyclopedia
n. In the Gr. drama, the leading character or actor in a play; hence, in general, any leading character.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the principal character in a work of fiction
n. a person who backs a politician or a team etc.
Word Usage
"The main protagonist is female, often develops complex relationships with the women she meets on her journey, and romance is mostly left in the background, at least in the first couple books."