American English

Definition of infiltrate verb from the Oxford Advanced American Dictionary



    , NAmE//ɪnˈfɪltreɪt//
    Verb Forms present simple I / you / we / they infiltrate
    he / she / it infiltrates
    past simple infiltrated
    -ing form infiltrating
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  1. 1[transitive, intransitive] to enter or make someone enter a place or an organization secretly, especially in order to get information that can be used against it infiltrate something The headquarters had been infiltrated by enemy spies. infiltrate somebody into something Rebel forces were infiltrated into the country. infiltrate into something The CIA agents successfully infiltrated into the terrorist organizations.
  2. 2[intransitive, transitive] infiltrate (into) something (technology) (especially of liquids or gases) to pass slowly into something Only a small amount of the rainwater actually infiltrates into the soil.
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noun [uncountable] the infiltration of terrorists from across the border the infiltration of rain into the soil
See the Oxford Advanced Learner's Dictionary entry: infiltrate