The story
- Latin · borrowed fromduplex“double, two-fold”
- English todayduplex
PIE word *dwóh₁ Borrowed from Latin duplex (“double, two-fold”), from duo (“two”) + plico (“fold together”); compare the roots of διπλόος (diplóos, “double”); compare also πλέκω (plékō, “twist, braid”). By surface analysis, duo- + -plex.
Etymology from Wiktionary, CC BY-SA 4.0.