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English definition of “interloper”

interloper

noun [C]     /ˈɪn.təˌləʊ.pər/ US  /-t̬ɚˌloʊ.pɚ/ disapproving
someone who becomes involved in an activity or a social group without being asked , or enters a place without permission : Security did not prevent an interloper from getting onto the stage at the opening ceremony .Taking part and getting involvedGetting involved for one's own benefit or against others' willCrimes against propertyArriving, entering and invading
(Definition of interloper noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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