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English definition of “unprecedented”

unprecedented

adjective     /ʌnˈpres.ɪ.den.tɪd/ US  /-t̬ɪd/
C2 never having happened or existed in the past: This century has witnessed environmental destruction on an unprecedented scale.NewModern and fashionable
(Definition of unprecedented adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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