/ Dictionary / Index S Sherman Antitrust Act: Meaning and Definition of Find definitions for: Sher'man Antitrust' Act" Pronunciation: [key] an act of Congress (1890) prohibiting any contract, conspiracy, or combination of business interests in restraint of foreign or interstate trade. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sherman Sherpa Related Content Daily Word Quiz: draconian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language