augmented octave
musical interval of 13 semitones spanning eight staff positions, enharmonically equivalent to a minor ninth
en-US/ɑɡˈmɛntəd ɑkˈteɪv/
en-GB/ɔːɡˈmɛntɪd ˈɒktɪv/
musical interval of 13 semitones spanning eight staff positions, enharmonically equivalent to a minor ninth