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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.