Breadcrumb Home > Dictionary > Index - -ility: Meaning and Definition of Find definitions for: -ility Pronunciation: [key] a combination ofandused to form abstract nouns from adjectives with stems inagility; civility; ability. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Ilion ilium ✖ Related Content Daily Word Quiz: deracinate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language