/ Dictionary / Index A apriorism: Meaning and Definition of Find definitions for: a•pri•o•rism Pronunciation: (ā"prī-ôr'iz-um, -ōr'-, ā"prē-, ä"prē-), [key] — n. Philos. belief in, or reliance upon, a priori reasoning, arguments, or principles. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. a priori apron Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language