Source : Webster's Revised Unabridged Dictionary (1913)

Libertinism \Lib"er*tin*ism\ (-t[i^]n*[i^]z'm), n.
   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 spirit of liberty and libertinism, of
            infidelity and profaneness, started up in the room
            of it.                                --Atterbury.