du·plex·er

[doo-plek-ser, dyoo-]
noun Electronics.
an automatic electronic switching device that permits the use of the same antenna for transmitting and receiving.

Origin:
1950–55; duplex + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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00:10
Duplexer is always a great word to know.
So is interrobang. Does it mean:
an extraordinary or unusual thing, person, or event; an exceptional example or instance.
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
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Example sentences
The repeater shall include an internal duplexer to permit the use of a single antenna.
Cavity filters are the primary component in a duplexer.
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