Breadcrumb Home > Dictionary > Index S substantialism: Meaning and Definition of Find definitions for: sub•stan•tial•ism Pronunciation: (sub-stan'shu-liz"um), [key] — n. Philos. the doctrine that substantial noumena exist as a basis for phenomena. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. substantial substantia nigra TrendingHere are the facts and trivia that people are buzzing about. Biographies: Notable Jewish Religious Leaders Current Events This Week: September 2023 Hispanic Population and the 2010 U.S. Census 50 Spookiest Halloween Quotes Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: nemesis Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language