1severe despondency and dejection, typically felt over a period of time and accompanied by feelings of hopelessness and inadequacy.
Medicine a condition of mental disturbance characterized by depression to a greater degree than seems warranted by the external circumstances, typically with lack of energy and difficulty in maintaining concentration or interest in life:clinical depression
a long and severe recession in an economy or market:the depression in the housing market
(the Depression or the Great Depression) the financial and industrial slump of 1929 and subsequent years.
2the act of lowering something or pressing something down:the depression of prices
a sunken place or hollow on a surface:the original shallow depressions were slowly converted to creeks
Astronomy & Geography the angular distance of an object below the horizon or a horizontal plane.
Meteorology a region of lower atmospheric pressure, especially a cyclonic weather system.
late Middle English: from Latin depressio(n-), from deprimere 'press down' (see depress)