'Interloper' definitions:
Definition of 'interloper'
From: WordNet
noun
Someone who intrudes on the privacy or property of another without permission [syn: intruder, interloper, trespasser]
Definition of 'Interloper'
From: GCIDE
- Interloper \In"ter*lo`per\ (?; 277), n. [Pref. inter- + D. looper a runner, fr. loopen to run; akin to E. leap. See Leap, and cf. Elope.] One who interlopes; one who unlawfully intrudes upon a property, a station, or an office; one who interferes wrongfully or officiously. [1913 Webster]
- The untrained man, . . . the interloper as to the professions. --I. Taylor. [1913 Webster]