Definitions

1. verb

to transmit (a signal) back to the sender, typically in response to a query or request.

“The aircraft was programmed to transpond its position to air traffic control.”

2. verb

to respond or react (to a situation or stimulus) with a specific action or signal.

“The radar system will transpond any unidentified flying object.”

3. noun

a device or system used to transmit signals back to the sender.

“The transponder in the aircraft’s navigation system helped the pilots stay on course.”