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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 lightMental and psychiatric disorders
(Definition of seasonal affective disorder from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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