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