[ doo-pleks, dyoo- ]
See synonyms for: duplexduplexesduplexity on Thesaurus.com

  1. paper or cardboard having different colors, finishes, or stocks on opposite sides.

  2. Printing.

    • a method of reproducing an illustration using two halftone plates, one black and the other in a color.

    • a printing press equipped to print both sides of a sheet in one pass.

  3. Genetics. a double-stranded region of DNA.

  1. having two parts; double; twofold.

  2. (of a machine) having two identical working units, operating together or independently, in a single framework or assembly.

  1. pertaining to or noting a telecommunications system, as most telephone systems, permitting the simultaneous transmission of two messages in opposite directions over one channel.

verb (used with object)
  1. 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

Other words from duplex

  • du·plex·i·ty, noun

Words Nearby duplex

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024

How to use duplex in a sentence

British Dictionary definitions for duplex


/ (ˈdjuːplɛks) /

  1. US and Canadian a duplex apartment or house

  2. a double-stranded region in a nucleic acid molecule

  1. having two parts

  2. machinery having pairs of components of independent but identical function

  1. permitting the transmission of simultaneous signals in both directions in a radio, telecommunications, or computer channel

Origin of duplex

C19: from Latin: twofold, from duo two + -plex -fold

Derived forms of duplex

  • duplexity, noun

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