/ Dictionary / Index R radical empiricism: Meaning and Definition of Find definitions for: rad'ical empir'icism Pronunciation: [key] (in the philosophy of William James) the doctrine that the only proper subject matter of philosophy is that which can be defined in terms of experience, and that relations are a part of experience. sensationalism (def. 3b). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radical chic radicalism Related Content Daily Word Quiz: portent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language