The Collaborative International Dictionary of English v.0.48:

Evidence \Ev"i*dence\, v. t. [imp. & p. p. Evidenced; p. pr. &
   vb. n. Evidencing.]
   To render evident or clear; to prove; to evince; as, to
   evidence a fact, or the guilt of an offender. --Milton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

evidenced
    adj 1: supported by evidence; "their evidenced friendliness to
           the US"