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]