infiltrate Meaning in the Cambridge English Dictionary
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Meaning of “infiltrate” in the English Dictionary

"infiltrate" in British English

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infiltrateverb [I + adv/prep, T]

uk   us   /ˈɪn.fɪl.treɪt/
to ​secretlybecomepart of a ​group in ​order to get ​information or to ​influence the way that ​groupthinks or ​behaves: A ​journalistmanaged to infiltrate the ​powerfuldrugcartel. to ​moveslowly into a ​substance, ​place, ​system, or ​organization: At about this ​time the new ​ideas about "​corporatemanagement" had ​begun to infiltrate (into)localgovernment.
infiltration
noun [U] uk   us   /ˌɪn.fɪlˈtreɪ.ʃən/
(Definition of infiltrate from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"infiltrate" in American English

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infiltrateverb

 us   /ɪnˈfɪlˌtreɪt, ˈɪn·fɪl-/

infiltrate verb (JOIN SECRETLY)

[I/T] to ​become a ​member of a ​group or ​organization to ​secretlygatherinformation about ​itsactivities

infiltrate verb (ENTER GROUND)

earth science [I] (of ​water) to ​flowslowly down into the ​earth from the earth's ​surface, for ​example, through ​cracks in ​rocks
infiltration
noun [U]  us   /ˌɪn·fɪlˈtreɪ·ʃən/ earth science
(Definition of infiltrate from the Cambridge Academic Content Dictionary © Cambridge University Press)
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