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English definition of “depression”

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depression

noun  /dɪˈpreʃ·ən/ us  

depression noun (CAUSE UNHAPPINESS)

[U] a feeling of sadness, or medical a type of mental illness that causes long periods of unhappiness: I’m just beginning to get over the depression from losing my job. medical Tiredness, loss of appetite, and sleeping problems are symptoms of depression.

depression noun (PRESS DOWN)

[C] a part in a surface that is slightly lower than the rest: There was a depression in the sand where he’d been lying.

depression noun (REDUCE)

world history [C] a period in which there is very little business activity and little employment: My parents lived through the Great Depression of the 1930s.
(Definition of depression from the Cambridge Academic Content Dictionary © Cambridge University Press)
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