Greater; more important or effective; first in force or consideration; leading; principal: as, the major premise or term of a syllogism.Greater in quantity, number, or extent: as, the major part of the revenue, of an assembly, or of a territory.Of age; having attained to majority.In musicOf intervals, standard or normal; literally “greater,” as compared with minor intervals.Of tones, distant by a major interval from a given tone: as, A is the major third of F, etc.Of tonalities and scales, standard or normal: characterized by a major third and also by a major sixth and seventh: opposed to minor.Of triads and chords, characterized by a major third between the root and the tone next above, and a perfect fifth between the root and the second tone above: opposed to minor, diminished, and augmented.Of cadences, ending in a major triad.Of modes in the modern sense, and thus of composition in general, characterized by the use of a major tonality and of major cadences: as, a piece is written throughout in the major mode.In logic, wider; broader; more extensive; a predicate to more subjects.n. Milit., an officer next in rank above a captain and below a lieutenant-colonel; the lowest field-officer.n. In law, a person who is old enough to manage his own concerns. See age, n., 3.n. In music, the major mode, or a major tonality or major chord, taken absolutely.n. In logicn. The major premise of a syllogism, which in direct syllogisms states the rule from which the conclusion is drawn.n. The major extreme of a syllogism.n. Same as mayor.To act the major; look and talk big, or with a military air.In prosody, noting the longer of two types of verse which bear a common name.