"major" in the noun sense

1. major

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

2. Major, John Major, John R. Major, John Roy Major

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

3. major

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

"she is a linguistics major"

4. major

the principal field of study of a student at a university

"her major is linguistics"

"major" in the verb sense

1. major

have as one's principal field of study

"She is majoring in linguistics"

"major" in the adjective sense

1. major

of greater importance or stature or rank

"a major artist"

"a major role"

"major highways"

2. major

greater in scope or effect

"a major contribution"

"a major improvement"

"a major break with tradition"

"a major misunderstanding"

3. major

greater in number or size or amount

"a major portion (a majority) of the population"

"Ursa Major"

"a major portion of the winnings"

4. major

of the field of academic study in which one concentrates or specializes

"his major field was mathematics"

5. 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"

6. major

of greater seriousness or danger

"a major earthquake"

"a major hurricane"

"a major illness"

7. major

of full legal age

8. major

of the elder of two boys with the same family name

"Jones major"

Source: WordNet® (An amazing lexical database of English)

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