illegal

1. illegal (adj) — sense 1

Definition: Contrary to, forbidden, or not authorized by law, especially criminal law.

Example: This is illegal, you know!

2. illegal (adj) — sense 2

Definition: Forbidden by established rules.

Example: Moving a pawn backward is an illegal move in chess.

3. illegal (adj) — sense 3

Definition: Totally fictitious, and often issued on behalf of a non-existent territory or country.

4. illegal (noun) — sense 4

Definition: An illegal act or technique.

Example: That whatſoever illegals hath been uſed againſt his friends and ſubjects, by impriſoning them without law, or impoſing fines upon their eſtates, be diſclaimed, and that perſons ſo committed be forthwith diſcharged.

5. illegal (noun) — sense 5

Definition: Contraband, esp. illegal substances such as drugs.

Example: …I've got illegals in my bottom…!

6. illegal (noun) — sense 6

Definition: A spy operating abroad illegally and under non-official cover, without visible ties to his or her country’s authorities.

Example: Anna Chapman, whose glamorous appearance won her more publicity in the Western media than all the other illegals combined, was so successfully deceived by a US sting operation that she handed over her SVR laptop to an FBI agent posing as a Russian.