/ Dictionary / Index I interiorism: Meaning and Definition of Find definitions for: in•te•ri•or•ism Pronunciation: (in-tēr'ē-u-riz"um), [key] — n. Philos. a theory that truth is discovered by introspection rather than by examination of the outside world. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. interior drainage interior lineman Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language