Depression

noun

1. a period during the 1930s when there was a worldwide economic depression and mass unemployment
2. a mental state characterized by a pessimistic sense of inadequacy and a despondent lack of activity
3. a long-term economic state characterized by unemployment and low prices and low levels of trade and investment
4. a sunken or depressed geological formation
5. sad feelings of gloom and inadequacy
6. an air mass of lower pressure; often brings precipitation"a low moved in over night bringing sleet and snow"
7. a state of depression and anhedonia so severe as to require clinical intervention
8. a concavity in a surface produced by pressing"he left the impression of his fingers in the soft mud"
9. angular distance below the horizon (especially of a celestial object)
10. pushing down"depression of the space bar on the typewriter"