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  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Impenetrability  \Im*pen`e*tra*bil"i*ty\,  n.  [Cf.  F. 
  imp['e]n['e]trabilit['e].] 
  1.  Quality  of  being  impenetrable. 
 
  2.  (Physics)  That  property  in  virtue  of  which  two  portions  of 
  matter  can  not  at  the  same  time  occupy  the  same  portion  of 
  space. 
 
  3.  Insusceptibility  of  intellectual  or  emotional  impression; 
  obtuseness;  stupidity;  coldness. 
 
  From  WordNet  r  1.6  [wn]: 
 
  impenetrability 
  n  1:  resistance  to  penetration  by  a  liquid  [syn:  {imperviousness}] 
  [ant:  {penetrability},  {penetrability}] 
  2:  incomprehensibility  by  virtue  of  being  too  dense  to 
  understand  [syn:  {impenetrableness}] 

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