major

n. military rank above captain and below colonel; adult, one who has reached legal majority; main subject of study chosen by a college or university student; major key (Music); major scale (Music)

v. specialize in a certain field of study

adj. more important than others; great; serious; having reached legal majority; pertaining to a main subject of study chosen by a college or university student; of a major scale (Music); based on a major scale (Music)

Major is a military rank the use of which varies according to country. Moreover, Major frequently denotes a mid-level command status officer (immediately superior to the rank of Captain and immediately subordinate to the rank of Lieutenant Colonel), however in some armies major is essentially a senior NCO (non-commissioned officer), a usage derived from "sergeant-major".
See more at Wikipedia.org...

Noun
1. British statesman who was prime minister from 1990 until 1997 (born in 1943)
(synonym) John Major, John R. Major, John Roy Major
(hypernym) statesman, solon, national leader

Noun
1. a commissioned military officer in the United States Army or Air Force or Marines; below lieutenant colonel and above captain
(hypernym) commissioned military officer
(classification) military, armed forces, armed services, military machine, war machine
2. a university student who is studying a particular field as the principal subject; "she is a linguistics major"
(hypernym) student, pupil, educatee
3. the principal field of study of a student at a university; "her major is linguistics"
(hypernym) discipline, subject, subject area, subject field, field, field of study, study, bailiwick, branch of knowledge
Verb
1. have as one's principal field of study; "She is majoring in linguistics"
(hypernym) study
Adjective
1. of greater importance or stature or rank; "a major artist"; "a major role"; "major highways"
(antonym) minor
(similar) great, outstanding
2. greater in scope or effect; "a major contribution"; "a major improvement"; "a major break with tradition"; "a major misunderstanding"
(antonym) minor
3. greater in number or size or amount; "a major portion (a majority) of the population"; "Ursa Major"; "a major portion of the winnings"
(antonym) minor
(similar) better
(attribute) majority, bulk
4. of the field of academic study in which one concentrates or specializes; "his major field was mathematics"
(antonym) minor
5. of a scale or mode; "major scales"; "the key of D major"
(antonym) minor
(classification) music
6. of greater seriousness or danger; "a major earthquake"; "a major hurricane"; "a major illness"
(antonym) minor
7. of full legal age; "major children"
(antonym) minor, nonaged, underage
(classification) law, jurisprudence
8. of the elder of two boys with the same family name; "Jones major"
(synonym) major(ip)
(similar) senior
(classification) United Kingdom, UK, Great Britain, GB, Britain, United Kingdom of Great Britain and Northern Ireland

n. major, Maj., military rank above captain and below colonel

n. major, military rank above captain and below colonel