/ Dictionary / Index O obligational: Meaning and Definition of Find definitions for: ob•li•ga•tion•al Pronunciation: (ob"li-gā'shu-nl), [key] — adj. obligatory. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: obligational (Thesaurus) obligation obligational authority Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language