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From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster] Quadruple time (Mus.), that in which each measure is divided into four equal parts. [1913 Webster]