/ ˈɪnfɪltreɪtə(r); NAmE / noun
a person who secretly becomes a member of a group or goes to a place, to get information or to influence the group
/ ˈɪnfɪltreɪtə(r); NAmE / noun
a person who secretly becomes a member of a group or goes to a place, to get information or to influence the group
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005