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English definition of “infiltrate”

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infiltrate

verb [I + adv/prep, T] uk   /ˈɪn.fɪl.treɪt/ us  
to secretly become part of a group in order to get information or to influence the way that group thinks or behaves: A journalist managed to infiltrate the powerful drug cartel. to move slowly into a substance, place, system, or organization: At about this time the new ideas about "corporate management" had begun to infiltrate (into) local government.
infiltration
noun [U] uk   /ˌɪn.fɪlˈtreɪ.ʃən/ us  
(Definition of infiltrate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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