[doo-pleks, dyoo-]
paper or cardboard having different colors, finishes, or stocks on opposite sides.
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.
Genetics. a double-stranded region of DNA.
having two parts; double; twofold.
(of a machine) having two identical working units, operating together or independently, in a single framework or assembly.
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)
to make duplex; make or change into a duplex: Many owners are duplexing their old houses for extra income.

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

duplexity, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
duplex (ˈdjuːplɛks)
1.  (US), (Canadian) a duplex apartment or house
2.  a double-stranded region in a nucleic acid molecule
3.  having two parts
4.  machinery having pairs of components of independent but identical function
5.  permitting the transmission of simultaneous signals in both directions in a radio, telecommunications, or computer channel
[C19: from Latin: twofold, from duo two + -plex-fold]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1817 (adj.) "composed of two parts," from L. duplex, from duo "two" + -plex, from Gk. plax (gen. plakos) "flat surface." The noun sense of "house for two families; two-story apartment" is Amer.Eng., 1922.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

duplex definition

Used to describe a communications channel that can carry signals in both directions, in contrast to a simplex channel which only ever carries a signal in one direction.
If signals can only flow in one direction at a time the communications is "half-duplex", like a single-lane road with traffic lights at each end. Walkie-talkies with a "press-to-talk" button provide half-duplex communications.
If signals can flow in both directions simultaneously the communications is "full-duplex", like a normal two-lane road. Telephones provide full-duplex communications.
The term "duplex" was first used in wireless, telegraph, and telephone communications. Nearly all communications circuits used by computers are two-way, so the term is seldom used.
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Carotid duplex is an ultrasound test that shows how well blood is flowing through the carotid arteries.
So a better option is duplex printing: printing at full size, on both sides of each sheet.
We went to his home, half a duplex of company housing, within earshot of the howling well fires.
Then came duplex penthouses, which meant there could be more apartments with a link to the top.
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