Breadcrumb Home > Dictionary > Index A affective disorder: Meaning and Definition of Find definitions for: af'fective disor'der Pronunciation: [key] — Psychiatry. Psychiatry. any mental disorder, as depressive disorder, bipolar disorder, or cyclothymia, in which a major disturbance of feelings or emotions is predominant. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. affective affective fallacy ✖ Related Content Daily Word Quiz: donnybrook Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language