Synonyms of 'witness' - Ask.com Search

witness

witness - noun

Someone who sees something occur: eyewitness, seer, viewer. See see.
Something visible or evident that gives grounds for believing in the existence or presence of something else: badge, evidence, index, indication, indicator, manifestation, mark, note, sign, signification, stamp, symptom, token. See show.
One who testifies, especially in court: attestant, attester, testifier. Law deponent. See law.
A formal declaration of truth or fact given under oath: testimony. Law deposition. See law.

To give grounds for believing in the existence or presence of: argue, attest, bespeak, betoken, indicate, mark, point to, testify. See show.
To confirm formally as true, accurate, or genuine: attest, certify, testify, vouch(for). See affirm.
To give evidence or testimony under oath: attest, swear, testify. Law depone, depose. See law.