/ Dictionary / Index F foundation stone: Meaning and Definition of Find definitions for: founda'tion stone" Pronunciation: [key] any of the stones composing the foundation of a building. a cornerstone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. foundation garment founder Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language