pertaining to the simultaneous operation of two radio transmitters or to the simultaneous reception and transmission of radio signals over a single antenna through the use of two frequencies.
Compare multiplex.

1875–80; di-1 + -plex

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American Heritage
Science Dictionary
diplex   (dī'plěks')  Pronunciation Key 
Capable of simultaneous transmission or reception of two electronic or radio signals through a single channel or component, as the simultaneous transmission of two radio signals through a single antenna.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

diplex definition

(From telegraphy) Two simultaneous transmissions in one direction.
Compare: duplex.

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
The diplex filter allows the placement of duplex signals onto a cable by the use of frequency division multiplexing.
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