transponder

noun tran·spon·der \ tran(t)-ˈspän-dər \
Updated on: 22 Nov 2017

Definition of transponder

: a radio or radar set that upon receiving a designated signal emits a radio signal of its own and that is used especially for the detection, identification, and location of objects and in satellites for relaying communications signals

Recent Examples of transponder from the Web

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Did You Know?

This word was coined during World War II by simply joining pieces of the words transmitter and responder. Transponders are basic to modern aviation and communications satellites, and they're finding new uses in fields such as medicine as well. But they're now also part of everyday life. The "E-ZPass" that lets you drive right through turnpike tollbooths is a transponder, and the car you're driving may not even start unless it recognizes the signal from your personal key's transponder. In a big crowded foot race, you may carry a tiny transponder on your shoe that records when you cross both the starting line and the finish line.

Origin and Etymology of transponder

transmitter + responder


TRANSPONDER Defined for English Language Learners

transponder

noun

Definition of transponder for English Language Learners

  • : a device that receives a radio signal and sends out a signal in response and that is used especially to show the location of something (such as an airplane)



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