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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

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

Century Dictionary and Cyclopedia

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

Wiktionary

  1. adj. Lacking licitness, but not invalid.
  2. adj. Breaking social norms.
  3. adj. Unlawful.

GNU Webster's 1913

  1. adj. Not permitted or allowed; prohibited; unlawful.

WordNet 3.0

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

Etymologies

  1. Latin illicitus : in-, not; see in-1 + licitus, lawful; see licit.

Examples

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‘illicit’ has been looked up 2282 times, loved by 5 people, added to 48 lists, commented on 1 time, and has a Scrabble score of 9.