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. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

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