Octave

1. (n.) The eighth day after a church festival, the festival day being included; also, the week following a church festival.
2. (n.) 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.
3. (n.) The whole diatonic scale itself.
4. (n.) The first two stanzas of a sonnet, consisting of four verses each; a stanza of eight lines.
5. (n.) A small cask of wine, the eighth part of a pipe.
6. (a.) Consisting of eight; eight.