/ Dictionary / Index S surtax: Meaning and Definition of Find definitions for: sur•tax Pronunciation: (n.sûr'taks"v.sûr'taks", sûr&sylptaks'), [key] — n. an additional or extra tax on something already taxed. one of a graded series of additional taxes levied on incomes exceeding a certain amount. —v.t. to put an additional or extra tax on; charge with a surtax. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: surtax (Thesaurus) Surt Surtees 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