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.

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.

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

Sep 22, 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 …

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

Master the word "ILLEGAL" in English: definitions, translations, synonyms, pronunciations, examples, and grammar insights - all in one complete resource.

There are six meanings listed in OED's entry for the word illegal, one of which is considered offensive. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

(Definition of illegal from the Cambridge Learner's Dictionary © Cambridge University Press)

Synonyms for ILLEGAL: unlawful, illicit, criminal, felonious, wrongful, unauthorized, forbidden, illegitimate; Antonyms of ILLEGAL: legal, lawful, legitimate, right, ethical, good, permitted, …