S: (n) major (a university student who is studying a particular field as the principal subject) "she is a linguistics major"
S: (n) major (the principal field of study of a student at a university) "her major is linguistics"
Verb
S: (v) major (have as one's principal field of study) "She is majoring in linguistics"
Adjective
S: (adj) major (of greater importance or stature or rank) "a major artist"; "a major role"; "major highways"
S: (adj) major (greater in scope or effect) "a major contribution"; "a major improvement"; "a major break with tradition"; "a major misunderstanding"
S: (adj) major (greater in number or size or amount) "a major portion (a majority) of the population"; "Ursa Major"; "a major portion of the winnings"
S: (adj) major (of the field of academic study in which one concentrates or specializes) "his major field was mathematics"
S: (adj) major ((of a scale or mode) having half steps between the third and fourth degrees and the seventh and eighth degrees) "major scales"; "the key of D major"
S: (adj) major (of greater seriousness or danger) "a major earthquake"; "a major hurricane"; "a major illness"