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depression

 
/dɪˈpreʃ·ən/ n [U] (CAUSE UNHAPPINESS)

Definition

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 n (CAUSE UNHAPPINESS) from the Cambridge Academic Content Dictionary © Cambridge University Press)

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