Breadcrumb Home > Dictionary > Index S Smithsonian Institution: Meaning and Definition of Find definitions for: Smith•so'ni•an Institu'tion Pronunciation: (smith-sō'nē-un), [key] an institution in Washington, D.C., founded 1846 with a grant left by James Smithson, for the increase and diffusion of knowledge: U.S. national museum and repository. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Smithson smithsonite TrendingHere are the facts and trivia that people are buzzing about. Did Birds Evolve from Dinosaurs? The Twelve Dancing Princesses Current Events This Week: January 2023 African Americans by the Numbers Andersen's Fairy Tales: Contents The Celtic Twilight: A Teller of Tales ✖ Related Content Daily Word Quiz: limpid Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language