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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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Examples for transponder
  • Unfortunately the plane's transponder communicates with secondary radar, not the primary receiver.
  • The discrepancy arose because of where the transponder boxes were placed in the cars.
  • He is also developing a tiny acoustic transponder that could be implanted in the jelly and used to track it with an unmanned sub.
  • And transponder signals can be detected by anyone with an appropriate receiver.
  • It consists of a radio transponder programmed to transmit a digital code that identifies its user.
  • Use of a cell phone or transponder heading to that area would surely be trackable.
  • Whether or not a transponder is upgradable is a question for the avionics manufacturer or supplier to determine the answer.
British Dictionary definitions for transponder

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 transponder
transponder
1945, from trans(mit) + (res)pond + -er
Online Etymology Dictionary, © 2010 Douglas Harper
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transponder 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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