noun
major third
A musical interval spanning four semitones. Used in music theory and analysis.
See also: 短三度
ドとミの間は長三度です。
The interval between C and E is a major third.
この和音は長三度を含んでいます。
This chord contains a major third.
A minor third, spanning three semitones, compared to the four semitones of a major third.
Compound of 長 (ちょう, 'long' or 'major') and 三度 (さんど, 'third'), a calque from Western music terminology.