1. • noun - a mental state characterized by a pessimistic sense of inadequacy and a despondent lack of activity
   • noun - a long-term economic state characterized by unemployment and low prices and low levels of trade and investment
   • noun - a sunken or depressed geological formation
   • noun - sad feelings of gloom and inadequacy
   • noun - a period during the 1930s when there was a worldwide economic depression and mass unemployment
   • noun - an air mass of lower pressure
   • noun - a state of depression and anhedonia so severe as to require clinical intervention
   • noun - a concavity in a surface produced by pressing
   • noun - angular distance below the horizon (especially of a celestial object)
   • noun - pushing down
2. • The act of depressing.
   • The condition of being depressed.
   • An area that is sunk below its surroundings; a hollow.
   • 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.
   • A reduction in activity or force.
   • A reduction in physiological vigor or activity: a depression in respiration.
   • A lowering in amount, degree, or position.
   • A period of drastic decline in a national or international economy, characterized by decreasing business activity, falling prices, and unemployment.
   • A region of low barometric pressure.
   • The angular distance below the horizontal plane through the point of observation.
   • The angular distance of a celestial body below the horizon.

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