Definition of unprecedented adjective from the Oxford Advanced American Dictionary

  

unprecedented

 adjective
adjective
NAmE//ʌnˈprɛsəˌdɛntəd//
 
 
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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.
unprecedentedly
 
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adverb a period of unprecedentedly high food prices
See the Oxford Advanced Learner's Dictionary entry: unprecedented