Definition of 999 from the Oxford Advanced Learner's Dictionary

 

999

 
BrE BrE//ˌnaɪn naɪn ˈnaɪn//
 
; NAmE NAmE//ˌnaɪn naɪn ˈnaɪn//
 
 
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the telephone number used in Britain to call the police, fire or ambulance services in an emergency (British English) Dial 999.