/ Dictionary / Index S spillover: Meaning and Definition of Find definitions for: spill•o•ver Pronunciation: (spil'ō"vur), [key] — n. the act of spilling over. a quantity of something spilled over; overflow. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: spillover (Thesaurus) spillikin spillproof Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language