responder

[ ri-spon-der ]

/ rɪˈspɒn dər /

a person or thing that responds.

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

Content related to responder

First recorded in 1875–80; respond + -er¹

One responder accused me of not even knowing what racism is.
What We Need Are Anti-Racists|Gene Robinson|August 24, 2014|DAILY BEAST
Social media have created a platform for every single American to become a “virtual first responder,” in word, donation, or deed.
Don’t Be a Tragedy Troll|Joshua DuBois|May 22, 2013|DAILY BEAST
A first responder pushed a wheelchair-bound woman to safety and then returned to the carnage.
Boston Marathon Explosions: The Heroes Who Responded to the Blasts|Nina Strochlic|April 16, 2013|DAILY BEAST
I am told that the first responder who found her looked into her eyes and told her ‘your parents love you.’
New Details Are Released About Contents of the Lanza House|Michael Daly|March 28, 2013|DAILY BEAST

“First of all, you are not going to die,” counseled the first responder, Calimhero.
Reddit Enlists 10,000 Volunteers to Prevent Suicides … They Hope|Jesse Singal|March 8, 2012|DAILY BEAST