https://www.merriam-webster.com/dictionary/illegal
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).
https://www.dictionary.com/browse/illegal
ILLEGAL definition: forbidden by law or statute. See examples of illegal used in a sentence.
https://dictionary.cambridge.org/dictionary/english/illegal
An illegal immigrant / alien is a person who has entered a country without government permission.
https://en.wiktionary.org/wiki/illegal
Feb 23, 2026 · 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 leg
https://www.oxfordlearnersdictionaries.com/definition/english/illegal_1
Definition of illegal adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
https://en.thefreedictionary.com/illegal
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.
https://www.collinsdictionary.com/us/dictionary/english/illegal
If something is illegal, the law says that it is not allowed. It is illegal to intercept radio messages. ...illegal drugs.
https://www.vocabulary.com/dictionary/illegal
Something illegal is against the law or breaks the rules. If you're reading this in jail, you've probably done something illegal, and if you're not in jail, there's plenty of time
https://www.britannica.com/dictionary/illegal
ILLEGAL meaning: 1 : not allowed by the law not legal; 2 : not allowed by the rules in a game
https://dictionary.cambridge.org/us/dictionary/english/illegal
ILLEGAL meaning: 1. not allowed by law: 2. not allowed by the rules of a sport: 3. an offensive word for someone…. Learn more.