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.),
v. t.
n. [ From Quintuple. ]
n. pl. five children born from one mother in a single pregnancy. [ PJC ]