augmented octave

/AA0 G M EH1 N T AH0 D AA0 K T IH0 V/
noun
  1. 1

    (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.

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