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Definition of Augmented octave
1. Noun. (music) A musical interval of the Western twelve-semitone system consisting of thirteen semitones and spanning eight degrees of the diatonic scale. It is one semitone wider than a perfect octave and enharmonically equivalent to a minor ninth/compound minor second. ¹
¹ Source: wiktionary.com
Lexicographical Neighbors of Augmented Octave
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