diminished fifth
noun1
Entertainment, Lifestyle, Music A type of tritone in musical composition formed by narrowing a perfect fifth by one chromatic semitones. In twelve-tone equal temperament, 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.
- C - G is a perfect fifth, C - G♭ is a diminished fifth, and C - G# is an augmented fifth.
- Related terms
- augmented fifth, augmented fourth, perfect fifth, dissonance, musical interval, tritone