/ Dictionary / Index O observational: Meaning and Definition of Find definitions for: ob•ser•va•tion•al Pronunciation: (ob"zûr-vā'shu-nl), [key] — adj. of, pertaining to, or founded on observation, esp. founded on observation rather than experiment. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: observational (Thesaurus) observation observation car 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