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English definition of “transponder”

transponder

noun [C]     /trænˈspɒn.dər/ US  /-ˈspɑːn.dɚ/ specialized
an electronic device that gives out a radio signal when it receives a similar signal telling it to: Aircraft are required by law to carry transponders, so that they can be identified.Radio
(Definition of transponder noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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