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



BrE BrE//ˈɪntələʊpə(r)//
; NAmE NAmE//ˈɪntərloʊpər//
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a person who is present in a place or a situation where they do not belong synonym intruder She felt like an interloper in her own family. Word Originlate 16th cent. (denoting an unauthorized trader trespassing on the rights of a trade monopoly): from inter- ‘amid’ + -loper as in archaic landloper ‘vagabond’ (from Middle Dutch landlooper).
See the Oxford Advanced American Dictionary entry: interloper