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English definition of “infiltrator”

infiltrator

noun [C] uk   /ˈɪn.fɪl.treɪ.tər/ us    /-t̬ɚ/
a person who secretly becomes part of a group in order to get information or to influence the way the group thinks or behaves: The infiltrator was identified and killed.Faking and pretending
(Definition of infiltrator from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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