Meaning of “major” in the English Dictionary

"major" in British English

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majoradjective

uk /ˈmeɪ.dʒər/ us /ˈmeɪ.dʒɚ/

major adjective (IMPORTANT)

B2 [ before noun ] more important, bigger, or more serious than others of the same type:

All of her major plays have been translated into English.
Sugar is a major cause of tooth decay.
There are two problems with this situation, one major, one minor.
Citrus fruits are a major source of vitamin C.
There has been a major change in attitudes recently.
The United States is a major influence in the United Nations.

More examples

majornoun [ C ]

uk /ˈmeɪ.dʒər/ us /ˈmeɪ.dʒɚ/

majorverb

uk /ˈmeɪ.dʒər/ us /ˈmeɪ.dʒɚ/

(Definition of “major” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"major" in American English

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majoradjective

us /ˈmeɪ·dʒər/

major adjective (IMPORTANT)

[ not gradable ] more important, bigger, or more serious than others of the same type:

Fresh fruits are a major source of vitamin C.
We awaited major new developments in the peace talks.

major adjective (MUSIC)

music based on a scale (= series of musical notes) in which there is a whole step (= sound difference) between each note except between the third and fourth notes and the seventh and eighth notes:

a major scale
a major chord

majornoun [ C ]

us /ˈmeɪ·dʒər/

major noun [ C ] (OFFICER)

a military officer of middle rank, above a captain

major noun [ C ] (SPECIAL SUBJECT)

the most important subject that a college or university student is studying, or the student studying that subject:

an English major

(Definition of “major” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"major" in Business English

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majoradjective

uk /ˈmeɪdʒər/ us

very large, important, or powerful, especially when compared with others of the same type:

a rail link connecting major European cities
Exports play a major role in key sub-sectors.
Our prices are lower on 2,000 items than those of all our major competitors.

a major change, difference, etc. affects a lot of people or organizations, sometimes in a way that causes difficulties for them:

Lack of skilled workers has become a major problem in recent years.
Governments now face major challenges in addressing problems in the global economy.
a major barrier/obstacle/boost

majornoun [ C, usually plural ]

uk /ˈmeɪdʒər/ us

COMMERCE one of the most important companies in a particular industry:

The majors are projected to collect up to $1 trillion in profits over the next 10 years.
Among the majors, this airline ranks first for on-time arrivals .

(Definition of “major” from the Cambridge Business English Dictionary © Cambridge University Press)