Definition of unprecedentedly adverb from the Oxford Advanced Learner's Dictionary

 

unprecedentedly

 adverb
adverb
BrE BrE//ʌnˈpresɪdentɪdli//
 
; NAmE NAmE//ʌnˈpresɪdentɪdli//
 
 
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in a way that has never happened, been done or been known before a period of unprecedentedly high food prices