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English definition of “transponder”

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transponder

noun [C] uk   /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.
Translations of “transponder”
in Chinese (Traditional) (發射機)應答器,轉發器…
in Chinese (Simplified) (发射机)应答器…
(Definition of transponder from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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