Longman Dictionary of Contemporary English homepage

depression

noun
     
de‧pres‧sion S3 W3
1 [uncountable and countable]
a) MP a medical condition that makes you very unhappy and anxious and often prevents you from living a normal life:
women who suffer from post-natal depression (=that sometimes happens after the birth of a baby)
b) a feeling of sadness that makes you think there is no hope for the future:
Lucy's mood was one of deep depression.
2

the (Great) Depression

the period during the 1930s when there was not much business activity and not many jobs
3 [uncountable and countable] a long period during which there is very little business activity and a lot of people do not have jobs [↪ recession]:
the devastating effects of economic depression
4 [countable] a part of a surface that is lower than the other parts:
depressions in the ground
5 [countable]HEM technical a mass of air under low pressure, that usually causes rain

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