depression de·pres·sion (dĭ-prěsh'ən)
The act of depressing or the state of being depressed.
A reduction in physiological vigor or activity.
A lowering in amount, degree, or position.
An inward displacement of a body part.
A hollow or sunken area.
The condition of feeling sad or despondent.
A psychotic or neurotic condition characterized by an inability to concentrate, insomnia, and feelings of extreme sadness, dejection, and hopelessness.