Definition of “seasonal affective disorder” - English Dictionary

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“seasonal affective disorder” in British English

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seasonal affective disordernoun [ U ]

uk /ˌsiː.zən.əl əˈfek.tɪv dɪˌsɔː.dər/ us /ˌsiː.zən.əl əˈfek.tɪv dɪˌsɔːr.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 Learner's Dictionary & Thesaurus © Cambridge University Press)