| Inverse | Augmented unison |
|---|---|
| Name | |
| Other names | Diminished eighth |
| Abbreviation | d8[1] |
| Size | |
| Semitones | 11 |
| Interval class | 1 |
| Just interval | 48:25, 49:26 (13-limit), 256:135,[2] 4096:2187 |
| Cents | |
| 12-Tone equal temperament | 1100[2] |
| Just intonation | 1129, 1108,[2] 1086 |
In music fromWestern culture, adiminished octave (Playⓘ) is aninterval produced bynarrowing aperfect octave by achromatic semitone.[1] As such, the two notes are denoted by the same letter but have differentaccidentals. 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 adissonant interval.[3]The diminished octave isenharmonically equivalent to themajor seventh.
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