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



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