In law and in religion, testimony's a solemn attestation as to the truth of a matter. Legal testimony In the law, testimony's a form of evidence that's obtained from a witness who makes a solemn statement or declaration of fact. Testimony may be oral or written, and it's usually made by oath or affirmation under penalty of perjury. Unless a witness's testifying as an expert witness, testimony in the form of opinions or inferences's generally limited to those opinions or inferences that're ratio… (More on Testify)