/ Dictionary / Index W William IV: Meaning and Definition of Find definitions for: William IV Pronunciation: [key] (“the Sailor-King”) 1765–1837, king of Great Britain and Ireland 1830–37 (brother of George IV). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. William III William of Malmesbury Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language