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English definition of “major”

major

adjective uk   /ˈmeɪ.dʒər/ us    /-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. Very important or urgent

major adjective (MUSIC)

[after noun] music belonging or relating to a musical scale that is generally thought to have a happy sound: the key of C major a concerto in A major Notes of the musical scale

major

noun [C] uk   /ˈmeɪ.dʒər/ us    /-dʒɚ/

major noun [C] (OFFICER)

(also Major) an officer of middle rank in the British, US, and many other armed forces: Her father was a major in the Scots Guards. Major Winters/Richard Winters [as form of address] Thank you, Major.Ranks in the ArmyRanks in the Air Force

major noun [C] (SPECIAL SUBJECT)

US the most important subject that a college or university student is studying, or the student himself or herself: What is your major, English or French? She was a philosophy major at an Ivy League college.Subjects and disciplines

major

verb uk   /ˈmeɪ.dʒər/ us    /-dʒɚ/
major in sth US B2 to study something as your main subject at college or university: She majored in philosophy at Harvard.Knowing and learning
(Definition of major from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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