To see, hear, or know by personal presence and perception. With harrison ford, kelly mcgillis, lukas haas, josef sommer. In the next three or four days, eleven witnesses.
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Certify, attest, witness, vouch mean to testify to the truth or genuineness of something. Certify usually applies to a written statement, especially one. A witness is someone who appears in a court of law to say what they know about a crime or other 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.
See examples of witness used in a sentence.