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From The Collaborative International Dictionary of English v.0.48:
Quintuple \Quin"tu*ple\, a. [L. quintus fifth: cf. F. quintuple, L. quintuplex. Cf. Quadruple.] Multiplied by five; increased to five times the amount; fivefold. [1913 Webster] Quintuple time (Mus.), a time having five beats in a measure. It is seldom used. [1913 Webster]