Breadcrumb Home > Dictionary > Index L libertinism: Meaning and Definition of Find definitions for: lib•er•tin•ism Pronunciation: (lib'ur-tē-niz"um, -ti-), [key] — n. libertine practices or habits of life; disregard of authority or convention in sexual or religious matters. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. libertine liberty ✖ Related Content Daily Word Quiz: hegira Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language