Definition of libertine noun from the Oxford Advanced Learner's Dictionary

 

libertine

 noun
noun
BrE BrE//ˈlɪbətiːn//
 
; NAmE NAmE//ˈlɪbərtiːn//
 
(formal, disapproving) Immoral
 
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a person, usually a man, who leads an immoral life and is interested in pleasure, especially sexual pleasure See related entries: Immoral Word Origin late Middle English (denoting a freed slave or the son of one): from Latin libertinus ‘freedman’, from liber ‘free’.
See the Oxford Advanced American Dictionary entry: libertine