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English definition of “witness”

witness

noun [C/U] (PERSON WHO SEES)   /ˈwɪt·nəs/
a person who sees an event happening, esp. a crime or an accident: [C] According to witnesses, the car used in the robbery was a green van with Pennsylvania license plates. Someone who is witness to something sees it: [U] She was witness to the tragic event. If you are a witness, you are asked to be present at a particular event and to sign (= write your name on) a document in order to prove that things have been done correctly: [C] The will has to be signed by two witnesses.
(Definition of witness noun (PERSON WHO SEES) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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