Any of four things that correspond to one another exactly

• Greatly increase output of ducal art and equip &hellip
• Any four copies

WordNet Word definitions in WordNet
adj. having four units or components; "quadruple rhythm has four beats per measure"; "quadruplex wire" [syn: quadruple , quadruplex , fourfold ] n. any four copies; any of four things that correspond to one another exactly; "it was signed in quadruplicate" ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Quadruplicate \Quad*ru"pli*cate\, a. [L. quadruplicatus, p. p.] Fourfold; doubled twice; four times repeated; as, a quadruplicate ratio, or a quadruplicate proportion. (Math.) Raised to the fourth power. [R.]

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1660s, from Latin quadruplicatus , past participle of quadruplicare "make fourfold," from quadri- "four" (see quadri- ) + plicare "to fold" (see ply (v.1)). Related: Quadruplicated ; quadruplicating .

Wiktionary Word definitions in Wiktionary
having four parts n. '''in quadruplicate''': four times over, in four copies v To replicate four times; to make fourfold; to quadruple.