Entry 1 sense Webster, 1913 lasciviency /(lăs*sĭv"ĭ*en*sy̆)/ · las·civ·i·en·cy · IPA /ləˈsɪvi.ənsi/ 01 n. Lasciviousness; wantonness. 1. Lasciviousness; wantonness.[Obs.]