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;
One illicit . . . transaction always leads to another. Burke.
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a. Illicit. [ R. ] Cotgrave. [ 1913 Webster ]