Source : Webster's Revised Unabridged Dictionary (1913)

Equivocalness \E*quiv"o*cal*ness\, n.
   The state of being equivocal.

Source : WordNet®

equivocalness
     n : unclearness by virtue of having more than one meaning [syn:
         {ambiguity}] [ant: {unambiguity}, {unambiguity}]