1.
Abbr. Maj. a. A comissioned rank in the U.S. Army, Air Force, or Marine Corps that is above captain and below lieutenant colonel. b. A similar rank in another military or paramilitary organization. c. One who holds this rank.
2. One that is superior in rank, importance, or ability: an oil-producing country considered as one of the majors.
3. Law. One who has reached full legal age.
4. a. A field of study chosen as an academic specialty. b. A student specializing in such studies: a linguistics major.
5. Logic. a. A major premise. b. A major term.
6. Music. A major scale, key, interval, or mode.
7. majors Sports. The major leagues.