GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Illicit , a. [L. illicitus; pref. il- not + licitus, p. p. of licere to be allowed or permitted: cf. F. illicite. See In- not, and License.] Not permitted or allowed; prohibited; unlawful; as, illicit trade; illicit intercourse; illicit pleasure.
   1913 Webster
   One illicit . . . transaction always leads to another.
   Burke.
   -- Il*lic"it*ly, adv. -- Il*lic"it*ness, n.
   1913 Webster