/ Dictionary / Index S split decision: Meaning and Definition of Find definitions for: split' deci'sion Pronunciation: [key] — Boxing. Boxing. a decision of a bout on whose outcome the referee and judges did not unanimously agree. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. split-brain split-dollar insurance Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language