/ Dictionary / Index A accidentalism: Meaning and Definition of Find definitions for: ac•ci•den•tal•ism Pronunciation: (ak"si-den'tl-iz"um), [key] — n. a system of medicine based on the symptoms of a disease, disregarding its origin or cause. any theory holding that some events have no causes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. accidental death benefit accident boat Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language