Definition of unprecedented adjective from the Oxford Advanced Learner's Dictionary

  

unprecedented

 adjective
adjective
BrE BrE//ʌnˈpresɪdentɪd//
 
; NAmE NAmE//ʌnˈpresɪdentɪd//
 
 
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that has never happened, been done or been known before The situation is unprecedented in modern times. There were unprecedented scenes of violence in the city’s main square.
See the Oxford Advanced American Dictionary entry: unprecedented