Octave(i) (Fr. octave; Ger. Oktave; It. ottava; Gk. diapasōn;; Sp. octava)
- William Drabkin
The interval between any two notes that are seven diatonic scale degrees apart (e.g. c–c′, d–d′). The term usually implies ‘perfect octave’, which is the sum of five whole tones and two diatonic semitones; however it also covers the augmented octave, which is the sum of a perfect octave and a chromatic semitone (e.g. ...