/ Dictionary / Index I ideal of pure reason: Meaning and Definition of Find definitions for: ide'al of pure' rea'son Pronunciation: [key] — Kantianism. Kantianism. God, seen as an idea of pure reason unifying the personal soul with the cosmos. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ideally ideal point Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language