Online Google Dictionary

unprecedented 中文解釋 wordnet sense Collocation Usage Collins Definition
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Never done or known before,
  1. Never done or known before
    • - the government took the unprecedented step of releasing confidential correspondence

  1. having no precedent; novel; "an unprecedented expansion in population and industry"
  2. (unprecedentedly) in an unprecedented manner
  3. Never before seen or done, without precedent
  4. "The belief that President Obama is so special that everything he does or says must be admired."