D defs.my
Entry 1 sense Webster, 1913

Interloper

/ĭn'-tẽrl-ōpˌ-ẽr/ · In·ter·lo·per · IPA /ˌɪntɚˈloʊ̯pɚ/
01 n. One who interlopes; one who unlawfully intrudes upon a property, a station, or an office; one who interferes wrongfully or officiously.
  1. 1.
    One who interlopes; one who unlawfully intrudes upon a property, a station, or an office; one who interferes wrongfully or officiously.
    “The untrained man, . . . the interloper as to the professions.” I. Taylor.