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unprecedented

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adjective unprecedented pronunciation in British English /ʌnˈpresɪˌdentɪd/
  1. never having happened or existed before
    The government took the unprecedented step of releasing confidential correspondence.
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    1. a.
      the greatest in size, amount, degree etc that has ever been known
      The flood waters have risen to unprecedented levels.

derived word

unprecedentedly

adverb
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