witness noun - definition in the Business English Dictionary - Cambridge Dictionaries Online

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witness

noun [C]
 
 
/ˈwɪtnəs/ LAW
someone who gives information in a court of law about a particular person or event, usually when there has been a crime or an accident: witness for the defence/prosecution The key witness for the prosecution was given police protection.act as/appear as/be called as a witness Doctors confirmed that he was not fit to be called as a witness in the trial. The police are appealing for witnesses. a credible/material witness a witness account/statement
someone who signs an official document to prove that an event has happened or that someone is who they say they are: He signed the treaty in the presence of six witnesses.
→  See also expert witness
(Definition of witness noun from the Cambridge Business English Dictionary © Cambridge University Press)
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