depression

de·pres·sion

noun \di-ˈpresh-ən\

Definition of DEPRESSION

1

: a displacement downward or inward <depression of the jaw>

2

: an act of depressing or a state of being depressed: as a (1) : a state of feeling sad (2) : a mood disorder marked especially by sadness, inactivity, difficulty with thinking and concentration, a significant increase or decrease in appetite and time spent sleeping, feelings of dejection and hopelessness, and sometimes suicidal thoughts or an attempt to commit suicide b : a reduction in functional activity, amount, quality, or force <depression of autonomic function> <depression of red blood cells>