/ Dictionary / Index W William III: Meaning and Definition of Find definitions for: William III Pronunciation: [key] (William III of Orange) 1650–1702, stadholder of the United Provinces of the Netherlands 1672–1702; king of England 1689–1702, joint ruler with his wife, Mary II. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. William II William IV Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language