/ Dictionary / Index O on-board: Meaning and Definition of Find definitions for: on-board Pronunciation: (on'bôrd', -bōrd', ôn'-), [key] — adj. provided, occurring, etc., on a vehicle: among the ship's many on-board services. installed and functional within a vehicle: on-board computers for aircraft. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: on-board (Thesaurus) Oñate on-camera Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language