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English definition of “infiltrate”

infiltrate

verb  /ɪnˈfɪlˌtreɪt, ˈɪn·fɪl-/ us  

infiltrate verb (JOIN SECRETLY)

[I/T] to become a member of a group or organization to secretly gather information about its activities

infiltrate verb (ENTER GROUND)

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