A radio or radar transmitter-receiver activated for transmission by reception of a predetermined signal.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "transponder" in a sentence
"Also, with Ku-band (geostationary orbit) satellites, each transponder is pointing at a sector."
"At 8: 13 Pete Zalewski sees the information on his radar screen that the transponder is no longer transmitting, that the pilot of American Airlines flight 11 is no longer responding and that the flight route has been changed."
"Your ship was flying at warp 1.1 in a non-designated area, your identification transponder is not functioning, and your warp field is not dampenedâ€ ¦ clickâ€ ¦ please stand byâ€ ¦ clickâ€ ¦ clickâ€ ¦ Sir, Sol is in the Sirius Sector, but this ship is not registered."