material witness n a witness whose testimony is both relevant to the matter at issue and required in order to resolve the matter
News & Articles material witness Portland police seeking woman with outstanding warrant Asia Watson, 19, has an outstanding felony material witness warrant and is described as 5-foot-6 and 140 pounds. June 21, 2013 - The Oregonian Reward offered to track down wanted Portland woman Portland police are trying to track a woman with a felony material witness warrant for her arrest. June 20, 2013 - FOX 12 Oregon