/ Dictionary / Index O oba: Meaning and Definition of Find definitions for: o•ba Pronunciation: (ô'bu), [key] — n. a hereditary tribal ruler among various peoples in the Benin region of western Africa. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Ob Obad. Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language