/ Dictionary / Index I instrumentalism: Meaning and Definition of Find definitions for: in•stru•men•tal•ism Pronunciation: (in"stru-men'tl-iz"um), [key] — n. Philos. the variety of pragmatism developed by John Dewey, maintaining that the truth of an idea is determined by its success in the active solution of a problem and that the value of ideas is determined by their function in human experience. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: instrumentalism (Thesaurus) instrumental conditioning instrumentalist Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language