/ Dictionary / Index F Frederick William I: Meaning and Definition of Find definitions for: Frederick William I Pronunciation: [key] 1688–1740, king of Prussia 1713–40. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Frederick William Frederick William II Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language