Usually means: Not permitted by law; forbidden.
Definitions Related words Phrases (New!) Mentions Lyrics History Colors (New!)
We found 35 dictionaries that define the word illegal:

General (26 matching dictionaries)
  1. illegal: Merriam-Webster
  2. illegal: Oxford Learner's Dictionaries
  3. illegal: American Heritage Dictionary of the English Language
  4. illegal: Collins English Dictionary
  5. illegal: Vocabulary.com
  6. Illegal, illegal, illegal: Wordnik
  7. illegal: Cambridge Advanced Learner's Dictionary
  8. illegal: Wiktionary
  9. illegal: Webster's New World College Dictionary, 4th Ed.
  10. illegal: The Wordsmyth English Dictionary-Thesaurus
  11. illegal: Infoplease Dictionary
  12. illegal: Dictionary.com
  13. illegal: Online Etymology Dictionary
  14. illegal: Cambridge Essential American English Dictionary
  15. Illegal (group), Illegal (rap group), Illegal (song), Illegal, The Illegal (film), The Illegal (novel): Wikipedia, the Free Encyclopedia
  16. Illegal: Online Plain Text English Dictionary
  17. illegal: Webster's Revised Unabridged, 1913 Edition
  18. illegal: Rhymezone
  19. illegal, illegal: AllWords.com Multi-Lingual Dictionary
  20. illegal: Webster's 1828 Dictionary
  21. illegal: FreeDictionary.org
  22. illegal: Mnemonic Dictionary
  23. illegal: TheFreeDictionary.com
  24. illegal: Longman Dictionary of Contemporary English

Business (6 matching dictionaries)
  1. illegal: Merriam-Webster Legal Dictionary
  2. illegal: Law.com Dictionary
  3. Everybody's Legal Dictionary (No longer online)
  4. Glossary of Legal Terms (No longer online)
  5. Bouvier's Law Dictionary 1856 Edition (No longer online)
  6. Illegal (disambiguation), illegal: Legal dictionary

Computing (1 matching dictionary)
  1. illegal: Netlingo

Medicine (1 matching dictionary)
  1. Illegal (disambiguation), illegal: Medical dictionary

Slang (1 matching dictionary)
  1. illegal: Urban Dictionary

(Note: See illegality as well.)

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Contrary to, forbidden, or not authorized by law, especially criminal law.
adjective:  Breaching certain enacted statutes of positive law; not lawful, not legal (cf. immoral, unethical)
adjective:  Forbidden by established rules.
adjective:  (philately, of an issue printed for collectors) Totally fictitious, and often issued on behalf of a non-existent territory or country.
adjective:  (of a person, sometimes offensive) Being or doing something illegally.
adjective:  (chiefly US, sometimes offensive) Being an illegal immigrant; residing in a country illegally.
noun:  (obsolete) An illegal act or technique.
noun:  (colloquial, in the plural, as illegals) Contraband, esp. illegal substances such as drugs.
noun:  (colloquial, offensive) An illegal immigrant.
noun:  (espionage) A spy operating abroad illegally and under non-official cover, without visible ties to his or her country’s authorities.

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