oc·tave /ˈɑktɪv, təv, ˌtev/
 音階


 octave
 *倍頻


 Oc·tave n.
 1. The eighth day after a church festival, the festival day being included; also, the week following a church festival. “The octaves of Easter.”
 2. Mus. (a) 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.  (b) The whole diatonic scale itself.
 Note: ☞ The ratio of a musical tone to its octave above is 1:2 as regards the number of vibrations producing the tones.
 3. Poet. The first two stanzas of a sonnet, consisting of four verses each; a stanza of eight lines.
    With mournful melody it continued this octave.   --Sir P. Sidney.
 Double octave. Mus. See under Double.
 Octave flute Mus., a small flute, the tones of which range an octave higher than those of the German or ordinary flute; -- called also piccolo. See Piccolo.
 4. A small cask of wine, the eighth part of a pipe.


 Oc·tave a. Consisting of eight; eight.

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 octave
      n 1: a feast day and the seven days following it
      2: a musical interval of eight tones [syn: musical octave]
      3: a rhythmic group of eight lines of verse