/ Dictionary / Index O overarch: Meaning and Definition of Find definitions for: o•ver•arch Pronunciation: (ō"vur-ärch'), [key] — v.t. to span with or like an arch: A new bridge overarches the river. —v.i. to form an arch over something: a cerulean sky overarching in the early twilight. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: overarch (Thesaurus) overanxious overarching Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language