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The definition of depression

7 Definitions of: depression

    1. noun, the act of depressing or state of being depressed
    2. noun, a depressed or sunken place or area
    3. noun, a mental disorder characterized by extreme gloom, feelings of inadequacy, and inability to concentrate
    4. noun, pathol an abnormal lowering of the rate of any physiological activity or function, such as respiration
    5. noun, an economic condition characterized by substantial and protracted unemployment, low output and investment, etc; slump
    6. noun, Also called: cyclone, low meteorol a large body of rotating and rising air below normal atmospheric pressure, which often brings rain
    7. noun, (esp in surveying and astronomy) the angular distance of an object, celestial body, etc, below the horizontal plane through the point of observation. Compare elevation
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From Collins