Lib'er·tin·ism (-tĭn*ĭz'm) noun 1. The state of a libertine or freedman. [ R.] Hammond. 2. Licentious conduct; debauchery; lewdness. 3. Licentiousness of principle or opinion. « That spirit of religion and seriousness vanished all at once, and a s... Found on http://www.encyclo.co.uk/webster/L/37