Definition of infiltration noun from the Oxford Advanced Learner's Dictionary

     

    infiltration

     noun
    noun
    BrE BrE//ˌɪnfɪlˈtreɪʃn//
     
    ; NAmE NAmE//ˌɪnfɪlˈtreɪʃn//
     
    [uncountable]
     
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  1. 1infiltration (of somebody) (into something) the act of entering a place or an organization secretly, especially in order to get information that can be used against it the infiltration of terrorists from across the border
  2. 2infiltration (of something) (into something) the process of passing slowly into something the infiltration of rain into the soil