witness

witness,

n one who has knowledge of an event; a person whose declaration under oath is received as evidence for any purpose.

witness, expert,

n a person whose education, training, and experience can provide the court with an assessment, opinion, or judgment within the area of his or her competence, which is not considered known or available to the general public.

witness, hostile,

n witness who manifests so much hostility or prejudice under examination (in chief or direct) that the party who has called the witness is allowed to cross-examine the witness (i.e., to treat him or her as though he or she had been called by the opposite party).

witness, lay,

n a witness who testifies only to firsthand knowledge of facts before judge and jury, different from an expert witness in that the witness is not allowed to testify to theories or hypothesize based on education or expertise.

witness marks,

n.pl the small hemispheric depressions that may be prepared in the bone surface in lieu of abutment grooves as a guide for seating the abutment posts of the implant.