major third

English

Noun

major third (plural major thirds)

  1. (music) A musical interval in Western music that is equal to or approximates a frequency ratio of 5/4. In twelve-tone equal temperament, it consists of four standard semitones, spans three degrees of the diatonic scale, and is enharmonically equivalent to a diminished fourth. Major scales are so named because of the major third interval between the tonic and mediant of a major tonic triad.
    Alternative form: (abbreviation) M3

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