/ Dictionary / Index I interactionism: Meaning and Definition of Find definitions for: in•ter•ac•tion•ism Pronunciation: (in"tur-ak'shu-niz"um), [key] — n. Philos. a theory that the mind and the body may each affect the other. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. interaction interactive 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