adj., n., & v.
--adj.
1. fourfold.
2 a having four parts. b involving four participants (quadruple alliance).
3 being four times as many or as much.
4 (of time in music) having four beats in a bar.
--n. a fourfold number or amount.
--v.tr. & intr. multiply by four; increase fourfold.
Derivatives:
quadruply adv.
Etymology: F f. L quadruplus (as QUADRI-, -plus as in duplus DUPLE)