responder

American  

[ri-spon-der] / rɪˈspɒn dər /

noun

1. a person or thing that responds.

2. Electronics. the part of a transponder that transmits the reply.

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Etymology

Origin of responder

First recorded in 1875–80; respond + -er ¹

Example Sentences

The law also allows law enforcement to obtain search warrants to seize the smartphones and computers of first responders as evidence.

From Los Angeles Times

“The general recommendation is to avoid the use of tourniquets, to avoid trying to extract the venom, to communicate with anyone nearby and know that responders are on the way,” he said.

From Los Angeles Times

New York emergency responders arrive on the scene.

From The Wall Street Journal

"I am grateful to our first responders, whose swift actions saved lives," he said.

From BBC

Another 13 people, including 11 passengers and two first responders, were taken to the hospital with injuries, according to broadcaster ABC.

From Barron's