1.a commissioned military officer in the United States Army or Air Force or Marines; below lieutenant colonel and above captain
2.a university student who is studying a particular field as the principal subject;
she is a linguistics major
3.the principal field of study of a student at a university;
her major is linguistics
4.of greater importance or stature or rank;
a major artist
5.greater in scope or effect;
a major contribution
6.greater in number or size or amount;
a major portion (a majority) of the population
7.of the field of academic study in which one concentrates or specializes;
his major field was mathematics
8.of a scale or mode;
major scales
9.of greater seriousness or danger;
a major earthquake
10.of full legal age;
major children
11.of the elder of two boys with the same family name;
Jones major
1.have as one's principal field of study;
She is majoring in linguistics