/ Dictionary / Index A active reason: Meaning and Definition of Find definitions for: ac'tive rea'son Pronunciation: [key] — Aristotelianism. Aristotelianism. an activity of intellect, embodying universal truth, potentially present in the mind of every individual, and when present, forming the only immortal part of the individual. Cf. passive reason. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. active-matrix active site Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language