Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Prohibited by law.
  • adj. Prohibited by official rules: an illegal pass in football.
  • adj. Unacceptable to or not performable by a computer: an illegal operation.
  • n. An illegal immigrant.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Contrary to or forbidden by law, especially criminal law.
  • adj. Forbidden by established rules
  • adj. Totally fictitious, and often issued on behalf of a non-existent territory or country.
  • adj. Being an illegal immigrant; residing in a country illegally.
  • n. An illegal immigrant.
  • n. An illegal resident spy.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not according to, or authorized by, law; specif., contrary to, or in violation of, human law; unlawful; illicit; hence, immoral

from The Century Dictionary and Cyclopedia

  • Not legal; contrary to law; unlawful; illicit: as, an illegal act; illegal commerce.
  • Synonyms Illegal, Felonious, etc. (See criminal.) Unlawful, Illegitimate, etc. (See lawful.)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. prohibited by law or by official or accepted rules

Etymologies

From il- (an assimilated version of in-) + legal. In senses relating to immigration, via clipping from illegal alien or illegal immigrant. (Wiktionary)

Examples

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