Meaning of involutional

in•vo•lu•tion•al

Pronunciation: (in"vu-l'shu-nl), [key]
— adj.
  1. of, pertaining to, or characteristic of involutional melancholia: involutional symptoms.
—n.
  1. a person who suffers from involutional melancholia.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.