noun
- an electronic device that receives a signal and automatically transmits a different signal in response
Usage: technical; aviation; telecommunications
Examples
- The aircraft’s transponder helps air traffic control track its location.
- Each car key contains a transponder that communicates with the vehicle’s security system.
- The satellite’s transponder relayed the television signal to Earth.
- Modern toll roads use transponders to automatically charge drivers.
- The ship’s transponder responded to the coast guard’s identification request.
- Radio frequency transponders are used in inventory tracking systems.