Longman Dictionary of Contemporary English homepage

major

3 verb
     
major3

major in something

phrasal verb
especially American EnglishSEC to study something as your main subject at college or university:
He's majoring in Political Science.

major on something

phrasal verb
especially British English to pay particular attention to one subject or thing:
The company is planning to major on offering the machines we need.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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