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English definition of “witness”

witness

noun [C] (LAW)    /ˈwɪt.nəs/
a person in a law court who says what they know about a legal case or a particular person: Ten witnesses are expected to testify at the trial today. The key witness for the prosecution was offered police protection after she received death threats.People appearing in court expert witness a person who is allowed to give their opinion in a law court because of their knowledge or practical experience of a particular subject: A psychiatrist was called as an expert witness for the defence.People appearing in court
(Definition of witness noun (LAW) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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