Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

evidential
     adj : serving as or based on evidence; "evidential signs of a
           forced entry"; "its evidentiary value" [syn: {evidentiary}]