perfect fourth

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English[edit]

Etymology[edit]

The word "perfect" refers to the fact that so-called "perfect intervals" are neither major nor minor.

Noun[edit]

perfect fourth (plural perfect fourths)

  1. A musical interval of the Western twelve-semitone system consisting of five semitones and spanning four degrees of the diatonic scale. It is enharmonically equivalent to an augmented third.
    The perfect fourth has a pitch ratio close to 4:3.

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Related terms[edit]