Definition of first responder noun from the Oxford Advanced American Dictionary

 

first responder

 noun
noun
NAmE//ˌfərst rɪˈspɑndər//
 
 
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a person such as a member of the police or fire department in a position to arrive first at an emergency, who has been trained to give basic medical treatment first responder training citizen/community first responders (= members of the public who have had special training for emergencies)
See the Oxford Advanced Learner's Dictionary entry: first responder