double octave

From The Collaborative International Dictionary of English v.0.48:

Octave \Oc"tave\, n. [F., fr. L. octava an eighth, fr. octavus
   eighth, fr. octo eight. See Eight, and cf. Octavo,
   1. The eighth day after a church festival, the festival day
      being included; also, the week following a church
      festival. "The octaves of Easter." --Jer. Taylor.
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   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.
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   Note: The ratio of a musical tone to its octave above is 1:2
         as regards the number of vibrations producing the
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   3. (Poet.) The first two stanzas of a sonnet, consisting of
      four verses each; a stanza of eight lines.
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            With mournful melody it continued this octave. --Sir
                                                  P. Sidney.
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   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.
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   4. A small cask of wine, the eighth part of a pipe.
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From The Collaborative International Dictionary of English v.0.48:

Double \Dou"ble\ (d[u^]b"'l), a. [OE. doble, duble, double, OF.
   doble, duble, double, F. double, fr. L. duplus, fr. the root
   of duo two, and perh. that of plenus full; akin to Gr.
   diplo`os double. See Two, and Full, and cf. Diploma,
   1. Twofold; multiplied by two; increased by its equivalent;
      made twice as large or as much, etc.
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            Let a double portion of thy spirit be upon me. -- 2
                                                  Kings ii. 9.
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            Darkness and tempest make a double night. --Dryden.
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   2. Being in pairs; presenting two of a kind, or two in a set
      together; coupled.
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            [Let] The swan, on still St. Mary's lake,
            Float double, swan and shadow.        --Wordsworth.
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   3. Divided into two; acting two parts, one openly and the
      other secretly; equivocal; deceitful; insincere.
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            With a double heart do they speak.    -- Ps. xii. 2.
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   4. (Bot.) Having the petals in a flower considerably
      increased beyond the natural number, usually as the result
      of cultivation and the expense of the stamens, or stamens
      and pistils. The white water lily and some other plants
      have their blossoms naturally double.
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   Note: Double is often used as the first part of a compound
         word, generally denoting two ways, or twice the number,
         quantity, force, etc., twofold, or having two.
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   Double base, or Double bass (Mus.), the largest and
      lowest-toned instrument in the violin form; the
      contrabasso or violone.

   Double convex. See under Convex.

   Double counterpoint (Mus.), that species of counterpoint or
      composition, in which two of the parts may be inverted, by
      setting one of them an octave higher or lower.

   Double court (Lawn Tennis), a court laid out for four
      players, two on each side.

   Double dagger (Print.), a reference mark ([dag]) next to
      the dagger ([dagger]) in order; a diesis.

   Double drum (Mus.), a large drum that is beaten at both

   Double eagle, a gold coin of the United States having the
      value of 20 dollars.

   Double entry. See under Bookkeeping.

   Double floor (Arch.), a floor in which binding joists
      support flooring joists above and ceiling joists below.
      See Illust. of Double-framed floor.

   Double flower. See Double, a., 4.

   Double-framed floor (Arch.), a double floor having girders
      into which the binding joists are framed.

   Double fugue (Mus.), a fugue on two subjects.

   Double letter.
      (a) (Print.) Two letters on one shank; a ligature.
      (b) A mail requiring double postage.

   Double note (Mus.), a note of double the length of the
      semibreve; a breve. See Breve.

   Double octave (Mus.), an interval composed of two octaves,
      or fifteen notes, in diatonic progression; a fifteenth.

   Double pica. See under Pica.

   Double play (Baseball), a play by which two players are put
      out at the same time.

   Double plea (Law), a plea alleging several matters in
      answer to the declaration, where either of such matters
      alone would be a sufficient bar to the action. --Stephen.

   Double point (Geom.), a point of a curve at which two
      branches cross each other. Conjugate or isolated points of
      a curve are called double points, since they possess most
      of the properties of double points (see Conjugate). They
      are also called acnodes, and those points where the
      branches of the curve really cross are called crunodes.
      The extremity of a cusp is also a double point.

   Double quarrel. (Eccl. Law) See Duplex querela, under

   Double refraction. (Opt.) See Refraction.

   Double salt. (Chem.)
      (a) A mixed salt of any polybasic acid which has been
          saturated by different bases or basic radicals, as the
          double carbonate of sodium and potassium,
      (b) A molecular combination of two distinct salts, as
          common alum, which consists of the sulphate of
          aluminium, and the sulphate of potassium or ammonium.

   Double shuffle, a low, noisy dance.

   Double standard (Polit. Econ.), a double standard of
      monetary values; i. e., a gold standard and a silver
      standard, both of which are made legal tender.

   Double star (Astron.), two stars so near to each other as
      to be seen separate only by means of a telescope. Such
      stars may be only optically near to each other, or may be
      physically connected so that they revolve round their
      common center of gravity, and in the latter case are
      called also binary stars.

   Double time (Mil.). Same as Double-quick.

   Double window, a window having two sets of glazed sashes
      with an air space between them.
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