Usage Note
Transpondeur is a technical term used in aviation, navigation, and telecommunications for a device that receives a signal and automatically transmits a reply. In air traffic control, it identifies aircraft on radar. The word is a calque of English 'transponder' (transmitter + responder).
Examples
"Le pilote active le transpondeur avant le décollage."
Natural Translation
The pilot activates the transponder before takeoff.
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