One who interlopes; one who unlawfully intrudes upon a property, a station, or an office; one who interferes wrongfully or officiously.
- One that interferes with the affairs of others, often for selfish reasons; a meddler.
- One that intrudes in a place, situation, or activity: "When these interlopers choke out native species, ecologists see a danger signal” ( William K. Stevens).
- Archaic One that trespasses on a trade monopoly, as by conducting unauthorized trade in an area designated to a chartered company.
- Archaic A ship or other vessel used in such trade.