/ Dictionary / Index S sum and substance: Meaning and Definition of Find definitions for: sum' and sub'stance Pronunciation: [key] main idea, gist, or point: the sum and substance of an argument. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sumac wax Sumatra Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language