Source : Webster's Revised Unabridged Dictionary (1913)

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.

   {Quintuple time} (Mus.), a time having five beats in a
      measure. It is seldom used.