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

  • adj. Not sanctioned by custom or law; unlawful.
  • adj. Linguistics Improperly formed; ungrammatical.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Not approved by law, but not invalid.
  • adj. Breaking social norms.
  • adj. Unlawful.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not permitted or allowed; prohibited; unlawful

from The Century Dictionary and Cyclopedia

  • Not authorized or permitted; prohibited; unlicensed; unlawful: as, illicit trade; illicit intercourse.
  • Acting unlawfully; clandestine.
  • Synonyms Unlawful, Illegitimate, etc. See lawful.

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

  • adj. contrary to or forbidden by law
  • adj. contrary to accepted morality (especially sexual morality) or convention


Latin illicitus : in-, not; see in-1 + licitus, lawful; see licit.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From French illicite, from Latin illicitus, from in- 'not' + licet ("it is allowed") (Wiktionary)



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