The Collaborative International Dictionary of English v.0.48:

Evince \E*vince"\, v. t. [imp. & p. p. Evinced; p. pr. & vb.
   n. Evincing.] [L. evincere vanquish completely, prevail,
   succeed in proving; e out + vincere to vanquish. See
   Victor, and cf. Evict.]
   1. To conquer; to subdue. [Obs.]
      [1913 Webster]

            Error by his own arms is best evinced. --Milton.
      [1913 Webster]

   2. To show in a clear manner; to prove beyond any reasonable
      doubt; to manifest; to make evident; to bring to light; to
      evidence.
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            Common sense and experience must and will evince the
            truth of this.                        --South.
      [1913 Webster]

WordNet (r) 3.0 (2006):

evince
    v 1: give expression to; "She showed her disappointment" [syn:
         express, show, evince]