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English definition of “depression”

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depression

noun uk   /dɪˈpreʃ.ən/ us  

depression noun (UNHAPPINESS)

B2 [U] the state of feeling very unhappy and without hope for the future: I was overwhelmed by feelings of depression.B2 [C or U] a mental illness in which a person is very unhappy and anxious (= worried and nervous) for long periods and cannot have a normal life during these periods: Tiredness, loss of appetite, and sleeping problems are all classic symptoms of depression. If you suffer from depression, it's best to get professional help.
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depression noun (NO ACTIVITY)

C2 [C] a period in which there is very little business activity and not many jobs: The stock market crash marked the start of a severe depression.

depression noun (WEATHER)

[C] specialized environment an area where the air pressure is low: The deep depression over the mid-Atlantic will gradually move eastwards during the day.

depression noun (HOLE)

[C] part of a surface that is slightly lower than the rest: There was a depression in the sand where he'd been lying.
(Definition of depression from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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