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Definition of solstice noun from the Oxford Advanced American Dictionary

 

solstice

 noun
noun
NAmE//ˈsoʊlstəs//
 
, NAmE//ˈsɑlstəs//
 
, NAmE//ˈsɔlstəs//
 
 
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either of the two times of the year at which the sun reaches its highest or lowest point in the sky in the middle of the day, marked by the longest and shortest days the summer/winter solstice
See the Oxford Advanced Learner's Dictionary entry: solstice