Breadcrumb Home > Dictionary > Index S sesquicentennial: Meaning and Definition of Find definitions for: ses•qui•cen•ten•ni•al Pronunciation: (ses"kwi-sen-ten'ē-ul), [key] — adj. pertaining to or marking the completion of a period of 150 years. —n. a 150th anniversary or its celebration. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sesquicentennial (Thesaurus) sesquicarbonate sesquioxide 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: saturnine Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language