/ Dictionary / Index I impossibility: Meaning and Definition of Find definitions for: im•pos•si•bil•i•ty Pronunciation: (im-pos"u-bil'i-tē, im"pos-), [key] — pl. -ties condition or quality of being impossible. something impossible. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: impossibility (Thesaurus) imposition impossible Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language