The Collaborative International Dictionary of English v.0.48:
Evidential \Ev`i*den"tial\, a. Relating to, or affording, evidence; indicative; especially, relating to the evidences of Christianity. --Bp. Fleetwood. "Evidential tracks." --Earle.. -- Ev`i*den"tial*ly, adv. [1913 Webster]WordNet (r) 3.0 (2006):
evidential adj 1: serving as or based on evidence; "evidential signs of a forced entry"; "its evidentiary value" [syn: evidential, evidentiary]