Definicija: Refers primarily to a third-country national who enters, and/or resides and/or works in an EU Member State without the necessary documents, permits, registration.

Definicija: Nekdo, ki zaradi nezakonitega vstopa ali pretečenega vizuma nima več zakonitega statusa v tranzitni državi oziroma državi gostiteljici. Pojem se nanaša na migrante, ki prekršijo pravila o vstopu v državo, in vsako osebo, ki nima dovoljenja, da ostane v državi gostiteljici (imenovan tudi tajni/nezakoniti/neevidentirani migrant ali migrant z neurejenim statusom).

Definicija: Third-country national who is officially found to be on the territory of an EU Member State and who does not fulfil, or no longer fulfils, the conditions for stay or residence in that Member State.