majors (Noun) — (baseball) the most important league in any sport (especially baseball).
majors (Noun) — (military) a commissioned military officer in the United States Army or Air Force or Marines; below lieutenant colonel and above captain.
majors (Noun) — A university student who is studying a particular field as the principal subject.
majors (Noun) — The principal field of study of a student at a university.
majors (Verb) — Have as one's principal field of study. ex. "She is majoring in linguistics"