[ 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.


Nearby words

  1. duple time,
  2. dupleix,
  3. dupleix, joseph françois,
  4. duplessis-mornay,
  5. duplet,
  6. duplex apartment,
  7. duplex chain,
  8. duplex house,
  9. duplex kidney,
  10. duplex lock

Origin of duplex

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

Related formsdu·plex·i·ty, noun

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for duplex

British Dictionary definitions for duplex


/ (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 Formsduplexity, 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

Word Origin and History for duplex



1817, "composed of two parts," from Latin duplex, from duo "two" (see two) + -plex, from Greek plax (genitive plakos) "flat surface." The noun sense of "house for two families; two-story apartment" is American English, 1922.

Online Etymology Dictionary, © 2010 Douglas Harper