first responder
noun
Definition of first responder
: a person (such as a police officer or an EMT) who is among those responsible for going immediately to the scene of an accident or emergency to provide assistance
From the M-W Editors
First Known Use of first responder
1970
FIRST RESPONDER Defined for Kids
first responder
noun
first re·spond·er
\-ri-ˈspän-dər\
Definition of first responder for Students
: a person (as a police officer or an EMT) who is responsible for going immediately to the scene of an accident or emergency to provide help
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