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transponder

[tran-spon-der] /trænˈspɒn dər/
noun
1.
a radio, radar, or sonar transceiver that automatically transmits a signal upon reception of a designated incoming signal.
Also, transpondor.
Origin
1940-1945
1940-45; trans(mitter) + (res)ponder
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for transpondor

transponder

/trænˈspɒndə/
noun
1.
a type of radio or radar transmitter-receiver that transmits signals automatically when it receives predetermined signals
2.
the receiver and transmitter in a communications or broadcast satellite, relaying received signals back to earth
Word Origin
C20: from transmitter + responder
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
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Word Origin and History for transpondor

transponder

n.

1945, from trans(mit) + (res)pond + agent noun suffix -er (1).

Online Etymology Dictionary, © 2010 Douglas Harper
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transpondor in Science
transponder
  (trān-spŏn'dər)   
A radio or radar transmitter and receiver that responds to an incoming signal either by broadcasting its own predetermined signal (as in aircraft identification systems) or by relaying the incoming signal at a different frequency (as in satellite communications).
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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