- quadruple (v.)
- late 14c., from Middle French quadrupler, from Late Latin quadruplare "make fourfold, multiply by four," from Latin quadruplus (adj.) "quadruple, fourfold" (see quadruple (adj.)).
- quadruple (adj.)
- 1550s, from Middle French quadruple (13c.), from Latin quadruplus "fourfold," from quadri- "four" (see quadru-) + -plus "-fold" (see -plus).
