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Language Research - Words
major · adjective always before noun /ˈmeɪ.dʒər/Full view
major
B2 more important, bigger or more serious than others of the same type
Dictionary examples:

This is a major problem for people in this region.

Sugar is a major cause of tooth decay.

America has played a major role in the peace process.

Citrus fruits are a major source of vitamin C.

There has been a major change in attitudes recently.

Learner example:

Some major changes are really necessary. (First Certificate in English; B2; Dutch)

major · noun /ˈmeɪ.dʒər/
major
B2 the most important subject that a college or university student studies, or a student studying that subject
Dictionary examples:

What's your major?

Diane's an English major.

I can speak English well as my major is English literature. (570170; First Certificate in English; Korea, South; B2 VANTAGE; 1999; Korean; Fail)

major · verb I /ˈmeɪ.dʒər/
major in
B2 to study something as your main subject in college or a university
Dictionary example:

She majored in earth sciences at Arizona State.

Learner example:

I have majored in English for four years. (First Certificate in English; B2; Chinese)

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