Etymology
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illicit (adj.)

c. 1500, from Old French illicite "unlawful, forbidden" (14c.), from Latin illicitus "not allowed, unlawful, illegal," from assimilated form of in- "not, opposite of" (see in- (1)) + licitus "lawful," past participle of licere "to be allowed" (see licence (n.)). Related: Illicitly.

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Definitions of illicit

illicit (adj.)
contrary to or forbidden by law;
illicit trade
Synonyms: illegitimate / outlaw / outlawed / unlawful
illicit (adj.)
contrary to accepted morality (especially sexual morality) or convention;
an illicit association with his secretary
From wordnet.princeton.edu