/ Dictionary / Index F Frederick III: Meaning and Definition of Find definitions for: Frederick III Pronunciation: [key] 1415–93, emperor of the Holy Roman Empire 1452–93; as Frederick IV, king of Germany 1440–93. (“the Wise”) 1463–1525, elector of Saxony 1486–1525: protector of Martin Luther. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Frederick II Frederick IV Related Content Daily Word Quiz: pristine Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language