Last Updated：2025/11/21
(music) A musical interval of the Western twelve-semitone system consisting of four semitones and spanning three degrees of the diatonic scale. Major scales are so named because of the major third interval between the tonic and mediant of a major tonic triad. It is enharmonically equivalent to a diminished fourth.
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major third
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Source Word
major third
Noun
(music)
A
musical
interval
of
the
Western
twelve-semitone
system
consisting
of
four
semitones
and
spanning
three
degrees
of
the
diatonic
scale.
Major
scales
are
so
named
because
of
the
major
third
interval
between
the
tonic
and
mediant
of
a
major
tonic
triad.
It
is
enharmonically
equivalent
to
a
diminished
fourth.
Japanese Meaning
音楽における長三度。西洋音楽の十二平均律に基づく音程の一種で、4半音からなり、ダイアトニック・スケールの3番目の音までの間隔を形成する。 / 主要スケールにおいて、トニック（主音）とメディアント（上3度の音）の間にある音程。
Sense（1）
(music)
A
musical
interval
of
the
Western
twelve-semitone
system
consisting
of
four
semitones
and
spanning
three
degrees
of
the
diatonic
scale.
Major
scales
are
so
named
because
of
the
major
third
interval
between
the
tonic
and
mediant
of
a
major
tonic
triad.
It
is
enharmonically
equivalent
to
a
diminished
fourth.
（ plural ）
