adj consisting of eight; eight.
2. octave ·noun the whole diatonic scale itself.
3. octave ·noun a small cask of wine, the eighth part of a pipe.
4. octave ·noun the first two stanzas of a sonnet, consisting of four verses each; a stanza of eight lines.
5. octave ·noun the eighth day after a church festival, the festival day being included; also, the week following a church festival.
6. octave ·noun the eighth tone in the scale; the interval between one and eight of the scale, or any interval of equal length; an interval of five tones and two semitones.