If something is illegal, the law says that it is not allowed. It is illegal to intercept radio messages. Birth control was illegal there until 1978.

Forbidden by law or statute. See examples of illegal used in a sentence. Definition of illegal adjective in oxford advanced learner's dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. The meaning of illegal is not according to or authorized by law : Contrary to or in violation of a law : Not sanctioned by official rules (as of a game).

The meaning of illegal is not according to or authorized by law : Contrary to or in violation of a law : Not sanctioned by official rules (as of a game). Not allowed by law: Not allowed by the rules of a sport: An offensive word for someone…. Learn more.

An offensive word for someone…. Learn more.