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1. someone in a court of law who tells the court what they saw or what they know about a crime:
• The government's case rested on one key (= important ) witness.
• I was asked to testify as a defense witness (= acting to defend the person accused of committing a crime ) .
• the main prosecution witness (= acting to show that the accused person is guilty )
ˌexpert ˈwitness LAWsomeone who has expert knowledge in a particular area and comes to a court of law to give their opinion about it:• He appeared as an expert witness before several government inquiries.
2. someone who is present when an official paper is signed and who also signs it to prove this:expert witness to• You will need two witnesses to the signing of the document.
to be present when someone signs an official document, and to sign it yourself to show this:• Will you witness my signature?
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Ⅰ.witness UK US /ˈwɪtnəs/ noun [C] 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.
Ⅱ.witness UK US /ˈwɪtnəs/ verb [T]► to see something happen, especially an accident or a crime: »The police want to hear from anyone who witnessed the incident.
»witness an attack/crime
► to sign your name on an official document to prove that an event has happened or that someone is who they say they are: witness an agreement/contract/signature »She asked a colleague to witness the contract.
► to experience something happening: »India witnessed significant jumps in its growth rates as it opened up its economy to international trade.
Financial and business terms. 2012.