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Definition of octave:

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


musical octave.

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