1. (adj)quadruplicate any four copies; any of four things that correspond to one another exactly Antonyms: single
2. (verb)quadruple, quadruplicate, quadruplex, fourfold, four-fold having four units or components Synonyms: quadruplicate, fourfold, quadruplex, quadruple, four-fold Antonyms: single
3. (verb)quadruplicate reproduce fourfold Antonyms: single