n. 专业；主修（major的复数）

n the most important league in any sport (especially baseball)

n a commissioned military officer in the United States Army or Air Force or Marines; below lieutenant colonel and above captain

n British statesman who was prime minister from 1990 until 1997 (born in 1943)

n a university student who is studying a particular field as the principal subject

n the principal field of study of a student at a university

v have as one's principal field of study