Quadruple \Quad"ru*ple\, a. [L. quadruplus, from quattuor four:
cf. F. quadruple. See Quadrate, and cf. Double.]
Fourfold; as, to make quadruple restitution; a quadruple
alliance.
[1913 Webster]
Quadruple time (Mus.), that in which each measure is
divided into four equal parts.
[1913 Webster]