perfect fifth

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English[edit]

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Noun[edit]

perfect fifth (plural perfect fifths)

  1. (music) an interval equal to that of between the second and third harmonics of the harmonic series; in equal temperament, an interval of seven semitones spanning five degrees of the diatonic scale. It is enharmonically equivalent to a diminished sixth.
    The perfect fifth has a pitch ratio close to 3:2.

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