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midnight sun

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noun
  1. the sun visible at midnight in mid-summer in arctic and antarctic regions.

Origin of midnight sun

First recorded in 1855–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for midnight sun

midnight sun

noun
  1. the sun visible at midnight during local summer inside the Arctic and Antarctic circles
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012