The meaning of ILLEGAL is not according to or authorized by law : contrary to or in violation of a law : unlawful, illicit; also : not sanctioned by official rules (as of a game).

ILLEGAL definition: forbidden by law or statute. See examples of illegal used in a sentence.

ILLEGAL definition: 1. not allowed by law: 2. not allowed by the rules of a sport: 3. an offensive word for someone…. Learn more.

Dec 20, 2025 · According to Black's Law Dictionary (2nd edition), "illegal" may mean only that something lacks authority of the law or support from law (that is, that it's not legal), not that it's against the law, …

1. Prohibited by law. 2. Prohibited by official rules: an illegal pass in football. 3. Unacceptable to or not performable by a computer: an illegal operation.

Definition of illegal adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Illegal definition: Prohibited by law.Origin of Illegal From French illégal, from Medieval Latin illegalis. In senses relating to immigration, via clipping from illegal alien or illegal immigrant. From Wiktionary

ILLEGAL meaning: 1 : not allowed by the law not legal; 2 : not allowed by the rules in a game

Illegal, unlawful, illegitimate, illicit, criminal can all describe actions not in accord with law. Illegal refers most specifically to violations of statutes or, in organized athletics, codified rules: an illegal seizure of …

If something is illegal, the law says that it is not allowed. It is illegal to intercept radio messages. ...illegal drugs.