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Definition of seasonal affective disorder noun from the Oxford Advanced Learner's Dictionary

seasonal affective disorder

noun
 
/ˌsiːzənl əˈfektɪv dɪsɔːdə(r)/
 
/ˌsiːzənl əˈfektɪv dɪsɔːrdər/
[uncountable]
(abbreviation SAD)
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  1. a condition in which a person feels sad and tired during late autumn and winter when there is not much light from the sunTopics Mental healthc2
See seasonal affective disorder in the Oxford Advanced American Dictionary

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