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English definition of “seasonal affective disorder”

seasonal affective disorder

noun [U] uk   /ˌsiː.zən.əl.əˈfek.tɪv.dɪˌsɔː.dər/ us    /-ˌsɔːr.dɚ/ (abbreviation SAD)
a medical condition in which a person does not have much energy and enthusiasm during the winter because of the reduced period of natural light
(Definition of seasonal affective disorder from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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