[ doo-pleks, dyoo- ]
/ ˈdu plɛks, ˈdyu- /



verb (used with object)

to make duplex; make or change into a duplex: Many owners are duplexing their old houses for extra income.

Origin of duplex

1810–20; < Latin: twofold, double, equivalent to du(o) two + -plex -plex

Related forms

du·plex·i·ty, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for duplexity


/ (ˈdjuːplɛks) /


US and Canadian a duplex apartment or house
a double-stranded region in a nucleic acid molecule


having two parts
machinery having pairs of components of independent but identical function
permitting the transmission of simultaneous signals in both directions in a radio, telecommunications, or computer channel

Derived Forms

duplexity, noun

Word Origin for duplex

C19: from Latin: twofold, from duo two + -plex -fold
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012