The Collaborative International Dictionary of English v.0.48:

Univocal \U*niv"o*cal\, a. [L. univocus; unus one + vox, vocis,
   a voice, word. See One, and Voice.]
   1. Having one meaning only; -- contrasted with equivocal.
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   2. Having unison of sound, as the octave in music. See
      Unison, n., 2.
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   3. Having always the same drift or tenor; uniform; certain;
      regular. [R.] --Sir T. Browne.
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   4. Unequivocal; indubitable. [Obs.] --Jer. Taylor.
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The Collaborative International Dictionary of English v.0.48:

Univocal \U*niv"o*cal\, n.
   1. (Aristotelian Logic) A generic term, or a term applicable
      in the same sense to all the species it embraces.
      [1913 Webster]

   2. A word having but one meaning.
      [1913 Webster]

WordNet (r) 3.0 (2006):

univocal
    adj 1: admitting of no doubt or misunderstanding; having only
           one meaning or interpretation and leading to only one
           conclusion; "unequivocal evidence"; "took an unequivocal
           position"; "an unequivocal success"; "an unequivocal
           promise"; "an unequivocal (or univocal) statement" [syn:
           unequivocal, univocal, unambiguous] [ant:
           ambiguous, equivocal]

Moby Thesaurus II by Grady Ward, 1.0:

89 Moby Thesaurus words for "univocal":
   absolute, apodictic, apparent, bound, certain, clean-cut, clear,
   clear and distinct, clear as crystal, clear as day, clear-cut,
   coherent, conclusive, connected, consistent, crisp, crystal-clear,
   crystalline, decisive, defined, definite, determinate, direct,
   distinct, evident, explicit, express, ineluctable, inevitable,
   limpid, loud and clear, lucid, luminous, manifest, monadal,
   monadic, necessary, obvious, one-piece, one-sided, palpable,
   patent, pellucid, perfectly sure, perspicuous, plain, positive,
   predestined, predetermined, simple, straightforward, sure,
   sure-enough, translucent, transparent, transpicuous, true,
   unambiguous, unconfused, unequivocal, uniangulate, unibivalent,
   unibranchiate, unicameral, unicellular, unicuspid, unidentate,
   unidigitate, unidimensional, unidirectional, uniflorous,
   unifoliate, unifoliolate, unigenital, uniglobular, unilateral,
   unilinear, uniliteral, unilobed, unilobular, unimodular,
   unimolecular, uniocular, unipart, unipartite, unipolar, univalent,
   unmistakable, well-defined