Source : Webster's Revised Unabridged Dictionary (1913)

Ambiguity \Am`bi*gu"i*ty\, n.; pl. {Ambiguities}. [L.
   ambiguitas, fr. ambiguus: cf. F. ambiguit['e].]
   The quality or state of being ambiguous; doubtfulness or
   uncertainty, particularly as to the signification of
   language, arising from its admitting of more than one
   meaning; an equivocal word or expression.

         No shadow of ambiguity can rest upon the course to be
         pursued.                                 --I. Taylor.

         The words are of single signification, without any
         ambiguity.                               --South.

Source : WordNet®

ambiguity
     n 1: an expression whose meaning cannot be determined from its
          context
     2: unclearness by virtue of having more than one meaning [syn:
        {equivocalness}] [ant: {unambiguity}, {unambiguity}]