Definition of infiltrator noun from the Oxford Advanced Learner's Dictionary

 

infiltrator

 noun
noun
BrE BrE//ˈɪnfɪltreɪtə(r)//
 
; NAmE NAmE//ˈɪnfɪltreɪtər//
 
 
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a person who secretly becomes a member of a group or goes to a place, to get information or to influence the group 32 people were interned as suspected infiltrators.
See the Oxford Advanced American Dictionary entry: infiltrator