Definition of 911 from the Oxford Advanced Learner's Dictionary

 

911

 
BrE BrE//ˌnaɪn wʌn ˈwʌn//
 
; NAmE NAmE//ˌnaɪn wʌn ˈwʌn//
 
 
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the telephone number used in the US to call the police, fire or ambulance services in an emergency (North American English) Call 911.
See the Oxford Advanced American Dictionary entry: 911