Definitions
1.nounAn illegal act or technique.
2.noun(plural, as illegals) Contraband, esp. illegal substances such as drugs.
3.nounAn illegal immigrant.
4.nounA spy working abroad illegally and undercover, without visible ties to his or her country’s authorities.
5.adjectiveContrary to or forbidden by law, especially criminal law."Nearly 40 million people live in UK areas with illegal air pollution"
6.adjectiveForbidden by established rules."Moving a pawn backward is an illegal move in chess."
7.adjective(of an issue printed for collectors) Totally fictitious, and often issued on behalf of a non-existent territory or country.
8.adjective(of a person, sometimes offensive) Being or doing something illegally."illegal immigrant; illegal logger; illegal pilot"
9.adjective(sometimes offensive) Being an illegal immigrant; residing in a country illegally.