adj. & v.
--adj.
1. fourfold.
2 of which four copies are made.
--v.tr.
1. multiply by four.
2 make four identical copies of.
Phrases and idioms:
in quadruplicate in four identical copies.
Derivatives:
quadruplication n.
Etymology: L quadruplicare f. quadruplex -plicis fourfold: cf. QUADRUPED, DUPLEX