[qua.dru.ple] vb qua.dru.pled ; qua.dru.pling vt (14c): to make four times as great or as many ~ vi: to become four times as great or as numerous
[2]quadruple n (15c): a sum four times as great as another [3]quadruple adj [MF or L; MF, fr. L quadruplus, fr. quadri- + -plus multiplied by--more at -fold] (1557) 1: having four units or members
2: being four times as great or as many
3: marked by four beats per measure "~ meter" -- qua.dru.ply adv -- qua.dru.plic.i.ty n