Meaning of major in English
1. very large, serious, or important; great in size, seriousness, or importance; main or chief
a major road
a major disaster
the major languages
Lack of money is a major part of the difficulty.
He had to go into hospital for a major operation.
1. a student’s main subject or course at college or university
I'm a psychology major.
2. a student who is studying a particular subject as the main part of their course at college or university
3. an officer ranking in the army and the US air force, above a captain and below a lieutenant colonel
1. study something as one’s main subject at university or college; specialize in
I majored in biology at college.