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Definition of the midnight sun noun from the Oxford Advanced Learner's Dictionary

the midnight sun

noun
 
/ðə ˌmɪdnaɪt ˈsʌn/
 
/ðə ˌmɪdnaɪt ˈsʌn/
[singular]
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  1. the sun that you can see at midnight in the middle of the summer near the North and South Poles
See the midnight sun in the Oxford Advanced American Dictionary
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