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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.

Etymology

Origin of responder

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

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Sally Holmes, a community first responder in Worthing, has delivered dozens of CPR training sessions this year.

From BBC • Dec. 29, 2025

I know this firsthand, having traveled to comfort victims of terror in Argentina, Paris and Turkey, and as a clergy first responder at Ground Zero on Sept. 11, 2001.

From The Wall Street Journal • Dec. 25, 2025

His grandson Mendy Amzalak told The Australian that he had rushed to the scene on the beach as a first responder.

From Barron's • Dec. 17, 2025

He’s also a certified wilderness first responder, adding an extra layer of preparedness to the group’s outdoor events.

From Los Angeles Times • Sep. 3, 2025

I was taking a certified first responder course with the lifeguards.

From "Adrift" by Paul Griffin

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.