/ Dictionary / Index S sesquipedalian: Meaning and Definition of Find definitions for: ses•qui•pe•da•li•an Pronunciation: (ses"kwi-pi-dā'lē-un, -dāl'yun), [key] — adj. —n. a sesquipedalian word. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sesquipedalian (Thesaurus) sesquioxide sesquiplane Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language