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English definition of “depression”

depression

noun [U] (CAUSE UNHAPPINESS)   /dɪˈpreʃ·ən/
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.
(Definition of depression noun (CAUSE UNHAPPINESS) from the Cambridge Academic Content Dictionary © Cambridge University Press)
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