/ Dictionary / Index I involutional: Meaning and Definition of Find definitions for: in•vo•lu•tion•al Pronunciation: (in"vu-l'shu-nl), [key] — adj. of, pertaining to, or characteristic of involutional melancholia: involutional symptoms. —n. a person who suffers from involutional melancholia. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. involution involutional melancholia 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