major
//ˈmeɪ.dʒɚ//
Adjective
Very important, serious, or significant in size, extent, or degree.
Climate change is a major problem facing the world today.
Greater in number, size, or extent than others of the same kind.
The major part of the budget goes to education.
Of full legal age; having reached the age of majority.
She became major at the age of 18 and could vote in the election.
Noun
A military officer ranking above a captain and below a lieutenant colonel.
Major Smith was promoted to lieutenant colonel last year.
A student's principal subject or course of study at a college or university.
Her major is biology.
A student specializing in a specified subject.
She is a biology major at the university.
A major key, interval, or scale in music.
The piece is written in C major.
Antonym
Verb
To specialize in a particular subject at a college or university.
She majored in biology at university.