major in WordNet English dictionary

1. the principal field of study of a student at a university
   "her major is linguistics"
   major 
   
2. a commissioned military officer in the United States Army or Air Force or Marines; below lieutenant colonel and above captain
   major 
   
3. a university student who is studying a particular field as the principal subject
   "she is a linguistics major"
   major 
   

1. have as one's principal field of study
   "She is majoring in linguistics"
   major 
   

1. greater in number or size or amount
   "a major portion (a majority) of the population"; "Ursa Major"; "a major portion of the winnings"
   major 
   
2. greater in scope or effect
   "a major contribution"; "a major improvement"; "a major break with tradition"; "a major misunderstanding"
   major 
   
3. of full legal age
   major 
   
4. of a scale or mode
   "major scales"; "the key of D major"
   major 
   
5. of the field of academic study in which one concentrates or specializes
   "his major field was mathematics"
   major 
   
6. of greater importance or stature or rank
   "a major artist"; "a major role"; "major highways"
   major 
   
7. of greater seriousness or danger
   "a major earthquake"; "a major hurricane"; "a major illness"
   major 
   
8. of the elder of two boys with the same family name
   "Jones major"
   major