Search Result for "perviousness": 
Wordnet 3.0

NOUN (1)

1. the quality of being penetrable (by people or light or missiles etc.);
[syn: penetrability, perviousness]



The Collaborative International Dictionary of English v.0.48:

Perviousness \Per"vi*ous*ness\, n.
   The quality or state of being pervious; as, the perviousness
   of glass. --Boyle.
   [1913 Webster]


WordNet (r) 3.0 (2006):

perviousness
    n 1: the quality of being penetrable (by people or light or
         missiles etc.) [syn: penetrability, perviousness] [ant:
         impenetrability, imperviousness]