major

A military rank between captain and lieutenant colonel.

“He used to be a major in the army.”

The main area of study of a student working toward a degree at a college or university.

“Midway through his second year of college, he still hadn't chosen a major.”

A student at a college or university concentrating on a given area of study.

“She is a math major.”

A person of legal age.

The major premise.

A touchdown, or major score.

A large, commercially successful company, especially a record label that is bigger than an indie.

(British slang) An elder brother (especially at a public school).

A large leaf-cutter ant that acts as a soldier, defending the nest.

To concentrate on a particular area of study as a student in a college or university

“I have decided to major in mathematics.”

Of great significance or importance.

Greater in number, quantity, or extent

“the major part of the assembly”

Of full legal age, having attained majority

Of a scale that follows the pattern: tone - tone - semitone - tone - tone - tone - semitone

“A major scale.”

Being the larger of two intervals denoted by the same ordinal number.

Containing the note a major third (four half steps) above the tonic.

(campanology) Bell changes rung on eight bells.