Octaves can be perfect, augmented or diminished. Below you can see that the number of steps determines the quality of the interval:

Perfect octave, 6 whole steps or 12 half steps:

perfect octave

Augmented octave, 6 1/2 whole steps or 13 half steps:

augmented octave

Diminished octave, 5 1/2 whole steps or 11 half steps:

diminished octave

See I > Intervals for related entries. To learn about go to Tutorials > Intervals.

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