witness
1. wit.ness \'wit-n*s\ n [ME witnesse, fr. OE witnes knowledge, testimony, witness, fr. 2]wit 1: attestation of a fact or event : TESTIMONY 2: one that gives evidence; specif : one who testifies in a cause o r before a judicial tribunal 3: one asked to be present at a transaction so as to be able to testify to its having taken place 4: one who has personal knowledge of something 5: something serving as evidence or proof : SIGN 2. witness vt 1: to testify to : ATTEST 2: to act as legal witness of 3: to furnish proof of : BETOKEN 4: to see or know by personal presence or direct cognizance 5: to constitute the scene of 1: to bear witness : TESTIFY 2: to bear witness to one's religious convictions
Webster's English Dictionary