/ Dictionary / Index S subrational: Meaning and Definition of Find definitions for: sub•ra•tion•al Pronunciation: (sub-rash'u-nl), [key] — adj. less than or almost rational. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. subquarterly subregion Related Content Daily Word Quiz: winsome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language