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witness

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noun American English pronunciation: witness /ˈwɪtnəs/ 
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singularwitness
pluralwitnesses
  1. 1
    [countable] someone who sees a crime, accident, or other event happen

    Witnesses reported hearing two gunshots.

    witness to:

    Any witnesses to the incident are asked to contact the police.

    1. a.
      someone who tells a court what they know about a crime

      More than twenty witnesses will be called.

      an expert witness for the defense/prosecution

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