responder
n. countable B2 Upper Intermediate US //ɹɪˈspɑndɝ// UK //ɹɪspˈɒndɐ// re·spon·der
n. a person or group that reacts to an emergency or a request for help. You often see this word used for police, fire, or medical workers who arrive at an accident scene.
n. a person or organization that provides assistance or reacts to an emergency, request, or event. Often used in the context of emergency services or technical support.
The first responder arrived at the scene within minutes.
The emergency responder provided immediate medical care to the injured hiker before the helicopter arrived.
In high-stakes environments, the speed and efficiency of the primary responder can significantly influence the overall outcome of a crisis situation.
From respond + -er.