/ Dictionary / Index S supply-side: Meaning and Definition of Find definitions for: sup•ply-side Pronunciation: (su-plī'sīd"), [key] — adj. Econ. of or pertaining to a theory that stresses the reduction of taxes, esp. for those of higher income, as a means of encouraging business investment and growth and stabilizing the economy. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. supply supply-sider Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language