Diminished-fifth Definition
noun
(music) A type of tritone in musical composition comprising of six semitones. It spans five diatonic scale degrees like a perfect fifth but narrower by a semitone. The number of diatonic degrees it spans is what distinguishes it from an augmented fourth.
E.g. C - G is a perfect fifth, C - G♭ is a diminished fifth, and C - G# is an augmented fifth.
Wiktionary
Other Word Forms of Diminished-fifth
Noun
Singular:
diminished-fifth
Plural:
diminished-fifths
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