Webster's English Dictionary

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penetration

Cross references:
  1. discernment           
 
pen.e.tra.tion \.pen-*-'tra--sh*n\ n 1: the act or process of penetrating : 
   as  1a: the act of entering a country so that actual establishment of 
   influence  is accomplished 1b: an attack that penetrates the enemy's front 
   or territory  2a: the depth to which something penetrates  2b: the power to 
   penetrate; specif : the ability to discern deeply  and acutely