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.
      [1913 Webster]

            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]

Moby Thesaurus II by Grady Ward, 1.0:

86 Moby Thesaurus words for "evince":
   affect, approve, argue, attest, bespeak, betoken, brandish,
   breathe, bring about, bring forth, bring forward, bring into view,
   bring out, bring to notice, cause, confirm, connote, dangle,
   demonstrate, denote, develop, disclose, display, divulge,
   dramatize, elicit, embody, enact, evidence, evoke, exhibit, expose,
   expose to view, express, extort, extract, flaunt, flourish,
   furnish evidence, give indication of, give sign, give token,
   go to show, highlight, illuminate, illustrate, imply, incarnate,
   indicate, involve, make clear, make plain, manifest, mark,
   materialize, mean, milk, parade, perform, point to, present,
   proclaim, produce, prove, provoke, represent, reveal, roll out,
   set forth, show, show forth, show signs of, signalize, signify,
   speak for itself, speak volumes, spotlight, stimulate, suggest,
   symptomatize, tell, tend to show, token, trot out, unfold, wave