Depression

n. sadness, low spirits; lowering, sinking; dent, hollow; economic slump

Depression generally signifies a lowering or reduction of some kind, for example in the context of mood, economy, or functionality:Psychology and moodDepression (mood), a common term for a sad or low mood or emotional state, or the loss of pleasure.Clinical depression, or major depressive disorder, a clinical term for a state of intense sadness, melancholia or despair that has advanced to the point of being disruptive to an individual's social functioning and/or activities of daily living. Subtypes of clinical depression:Melancholic depression, characterized by the inability to find pleasure in positive things combined with physical agitation, insomnia, or decreased appetite.Atypical depression, a common long term cyclical form of depression in which the individual can feel enjoyment, eat, and sleep, but there is significant lethargy, a 'leaden' feeling, and a strong response to rejection-related issues.Psychotic depression, in which clinical depression co-exists with psychotic or delusional perceptions.Postpartum depression, depression following childbirth, sometimes known as 'postpartum blues'.
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Depression /de·pres·sion/ 1. a hollow or depressed area; downward or inward displacement. 2. a lowering or decrease of functional activity. 3. [more]Depression - Community and Resources

Noun
1. a time period during the 1930s when there was a worldwide economic depression and mass unemployment
(synonym) the Depression, the Great Depression
(hypernym) time period, period of time, period

Noun
1. a mental state characterized by a pessimistic sense of inadequacy and a despondent lack of activity
(antonym) elation
(hypernym) psychological state, mental state
(hyponym) melancholia
2. a long-term economic state characterized by unemployment and low prices and low levels of trade and investment
(synonym) slump, economic crisis
(hypernym) financial condition, economic condition
(hyponym) Great Depression
3. a sunken or depressed geological formation
(synonym) natural depression
(hypernym) geological formation, formation
(hyponym) basin
4. sad feelings of gloom and inadequacy
(hypernym) sadness, unhappiness
(hyponym) demoralization, demoralisation
5. an air mass of lower pressure; often brings precipitation; "a low moved in over night bringing sleet and snow"
(synonym) low, low pressure
(hypernym) air mass
(part-holonym) cyclone
6. a state of depression and anhedonia so severe as to require clinical intervention
(synonym) depressive disorder, clinical depression
(hypernym) affective disorder, major affective disorder, emotional disorder, emotional disturbance
(hyponym) agitated depression
7. a concavity in a surface produced by pressing; "he left the impression of his fingers in the soft mud"
(synonym) impression, imprint
(hypernym) concave shape, concavity, incurvation, incurvature
(hyponym) dimple
8. angular distance below the horizon (especially of a celestial object)
(hypernym) angular position
9. pushing down; "depression of the space bar on the typewriter"
(hypernym) push, pushing
(hyponym) click, mouse click
(derivation) press down, depress

n. depression, low spirits; economic slump