The pervasive feeling, tone, and internal emotional state of an individual which, when impaired, can markedly influence virtually all aspects of a person's behavior or his or her perception of external events.
* * *
* * *
(m
d) [A.S. mōd disposition] a pervasive and sustained emotion that, when extreme, can color one's whole view of life and markedly affect behavior. Mood is generally used to refer to either elation or depression. See also mood disorders, under disorder.
Medical dictionary. 2011.