What is the Meaning of: Illicit | Concept and Definition of: Illicit

Means wrongful act contrary to law. The illicit cause, moreover, is one that opposes the laws or morality: "the intendant has committed a wrongful act and needs facing Justice," "my dismissal is at the origin of an illicit cause: I have the right to demand compensation.
Illicit enrichment is a concept that refers to enrich by means contrary to law. Usually, the term is used to refer to civil servants who take advantage of their power and their authority to carry out illegal business or obtaining money through bribes (subornations): "the president will be charged with illicit enrichment by the fact of not being able to justify how he acquired a villa with a value of one million dollars" , "The official was accused of illicit enrichment and may spend five years behind bars.
The antonym of illicit is lawful (from latin licĭtus). It allows to designate what is fair and permitted in accordance with justice and the reason: "the behavior of this gentleman may be questioned from the ethical point of view although it is lawful and non punishable by law".