/ ɪˈlɪsɪt; NAmE / adjective
1.
not allowed by the law
SYN illegal :
illicit drugs
2.
not approved of by the normal rules of society :
an illicit love affair
► illicit·ly adverb
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WORD ORIGIN
early 16th cent.: from French , or from Latin illicitus , from in- not + licitus allowed, from the verb licere .