# Diminished octave

Inverse | Augmented unison |
---|---|

Name | |

Other names | Diminished eighth |

Abbreviation |
d8^{[1]} |

Size | |

Semitones | 11 |

Interval class | 1 |

Just interval | 48:25 |

Cents | |

Equal temperament | 1100 |

24 equal temperament | 1100 |

Just intonation | 1129 |

In classical music from Western culture, a **diminished octave** ( Play ) is an interval produced by narrowing a perfect octave by a chromatic semitone.^{[1]} As such, the two notes are denoted by the same letter but have different accidentals. For instance, the interval from C4 to C5 is a perfect octave, twelve semitones wide, and both the intervals from C♯4 to C5, and from C4 to C♭5 are diminished octaves, spanning eleven semitones. Being diminished, it is considered a dissonant interval.^{[2]}

The diminished octave is enharmonically equivalent to the major seventh.

## Sources

- 1 2 Benward & Saker (2003).
*Music: In Theory and Practice, Vol. I*, p.54. ISBN 978-0-07-294262-0. Specific example of an d8 not given but general example of perfect intervals described. - ↑ Benward & Saker (2003), p.92.

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