Definitions from Wiktionary (illegal)

▸ adjective:  Contrary to, forbidden, or not authorized by law, especially criminal law.
▸ adjective:  Breaching certain enacted statutes of positive law; not lawful, not legal (cf. immoral, unethical)
▸ adjective:  Forbidden by established rules.
▸ adjective:  (philately, of an issue printed for collectors) Totally fictitious, and often issued on behalf of a non-existent territory or country.
▸ adjective:  (of a person, sometimes offensive) Being or doing something illegally.
▸ adjective:  (chiefly US, sometimes offensive) Being an illegal immigrant; residing in a country illegally.
▸ noun:  (obsolete) An illegal act or technique.
▸ noun:  (colloquial, in the plural, as illegals) Contraband, esp. illegal substances such as drugs.
▸ noun:  (colloquial, offensive) An illegal immigrant.
▸ noun:  (espionage) A spy operating abroad illegally and under non-official cover, without visible ties to his or her country’s authorities.
▸ Also see illegal

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