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The definition of major

20 Definitions of: major

1. noun, military an officer immediately junior to a lieutenant colonel
2. noun, a person who is superior in a group or class
3. noun, a large or important company
4. noun, music a major key, chord, mode, or scale
5. noun, a) the principal field of study of a student at a university, etc b) a student who is studying a particular subject as his principal field
6. noun, a person who has reached the age of legal majority
7. noun, logic a major term or premise
8. noun, the the major leagues
9. adjective, larger in extent, number, etc
10. adjective, of greater importance or priority
11. adjective, very serious or significant
12. adjective, main, chief, or principal
13. adjective, of, involving, or making up a majority
14. adjective, music a) (of a scale or mode) having notes separated by the interval of a whole tone, except for the third and fourth degrees, and seventh and eighth degrees, which are separated by a semitone b) relating to or employing notes from the major scale c) denoting a specified key or scale as being major d) denoting a chord or triad having a major third above the root e) (in jazz) denoting a major chord with a major seventh added above the root
15. adjective, logic constituting the major term or major premise of a syllogism
16. adjective, of or relating to a student's principal field of study at a university, etc
17. adjective, the elder: used after a schoolboy's surname if he has one or more younger brothers in the same school
18. adjective, of full legal age
19. adjective, bell-ringing of, relating to, or denoting a method rung on eight bells
20. verb, to do one's principal study (in a particular subject)
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Synonyms:	great, important, vital, critical, significant, serious, radical, crucial, outstanding, grave	And more...
Antonyms:	minor

From Collins