perceptibility

from WordNet (r) 3.0 (2006)

perceptibility
    n 1: the property of being perceptible by the mind or the senses
         [ant: {imperceptibility}]

from The Collaborative International Dictionary of English v.0.48

Perceptibility \Per*cep`ti*bil"i*ty\, n. [Cf. F.
   perceptibilit['e].]
   1. The quality or state of being perceptible; as, the
      perceptibility of light or color.
      [1913 Webster]

   2. Perception. [R.] --Dr. H. More.
      [1913 Webster]