Definition: quadruple

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Source: WordNet (r) 1.7 

quadruple
     adj 1: having four units or components; "quadruple rhythm has four
            beats per measure" [syn: quadruplicate, fourfold]
     2: four times as great or many; "a fourfold increase in the
        dosage" [syn: fourfold]
     n : a quantity that is four times as great as another
     v : increase fourfold; "His stock earning quadrupled"

Source: Webster's Revised Unabridged Dictionary (1913) 

Quadruple \Quad"ru*ple\, a. [L. quadruplus, from quattuor four:
   cf. F. quadruple. See Quadrate, and cf. Double.]
   Fourfold; as, to make quadruple restitution; a quadruple
   alliance.

   Quadruple time (Mus.), that in which each measure is
      divided into four equal parts.
Quadruple \Quad"ru*ple\, n. [Cf. F. quadruple, L. quadruplum.]
   four times the sum or number; a fourfold amount; as, to
   receive to quadruple of the amount in damages.
Quadruple \Quad"ru*ple\, v. t. [imp. & p. p. Quadrupled; p.
   pr. & vb. n. Quadrupling.] [L. quadruplare: cf. F.
   quadrupler.]
   To multiply by four; to increase fourfold; to double; to
   double twice. --A. Smith.
Quadruple \Quad"ru*ple\, v. i.
   To be multiplied by four; to increase fourfold; to become
   four times as much.