Wit·ness n.
 1. Attestation of a fact or an event; testimony.
    May we with . . . the witness of a good conscience, pursue him with any further revenge?   --Shak.
    If I bear witness of myself, my witness is not true.   --John v. 31.
 2. That which furnishes evidence or proof.
    Laban said to Jacob, . . . This heap be witness, and this pillar be witness.   --Gen. xxxi. 51, 52.
 3. One who is cognizant; a person who beholds, or otherwise has personal knowledge of, anything; as, an eyewitness; an earwitness.  “Thyself art witness I am betrothed.”
    Upon my looking round, I was witness to appearances which filled me with melancholy and regret.   --R. Hall.
 4. Law (a) One who testifies in a cause, or gives evidence before a judicial tribunal; as, the witness in court agreed in all essential facts.  (b) One who sees the execution of an instrument, and subscribes it for the purpose of confirming its authenticity by his testimony; one who witnesses a will, a deed, a marriage, or the like.
 Privileged witnesses. Law See under Privileged.
 With a witness, effectually; to a great degree; with great force, so as to leave some mark as a testimony. [Colloq.]
    This, I confess, is haste with a witness.   --South.