[de.pres.sion] n (14c) 1 a: the angular distance of a celestial object below the horizon b: the size of an angle of depression
2: an act of depressing or a state of being depressed: as a: a pressing down: lowering b (1): a state of feeling sad: dejection (2): a psychoneurotic or psychotic disorder marked esp. by sadness, inactivity, difficulty in thinking and concentration, a significant increase or decrease in appetite and time spent sleeping, feelings of dejection and hopelessness, and sometimes suicidal tendencies c (1): a reduction in activity, amount, quality, or force (2): a lowering of vitality or functional activity
3: a depressed place or part: hollow
4: low 1b
5: a period of low general economic activity marked esp. by rising levels of unemployment