/ Dictionary / Index P presumption of law: Meaning and Definition of Find definitions for: presump'tion of law' Pronunciation: [key] — Law. Law. a presumption based upon a policy of law or a general rule and not upon the facts or evidence in an individual case. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. presumption of innocence presumption of survivorship Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language