Depression

a mental state characterized by a pessimistic sense of inadequacy and a despondent lack of activity

a long-term economic state characterized by unemployment and low prices and low levels of trade and investment

a sunken or depressed geological formation

sad feelings of gloom and inadequacy

a period during the 1930s when there was a worldwide economic depression and mass unemployment

an air mass of lower pressure

a state of depression and anhedonia so severe as to require clinical intervention

a concavity in a surface produced by pressing

angular distance below the horizon (especially of a celestial object)

pushing down