Noun midnight sun has 1 sense

1. midnight sun - the sun visible at midnight (inside the arctic or antarctic circles)
   --₁ is a kind of atmospheric phenomenon
   

1. The natural phenomenon occurring in polar regions during summer where the sun remains visible at midnight.

2. A novel by Stephenie Meyer, which tells the story of Bella Swan and Edward Cullen from Edward's perspective.

1. The locals in Norway eagerly await the midnight sun every year.

2. In Alaska, you can experience the beauty of the midnight sun during the summer months.

3. I couldn't sleep because the bright light of the midnight sun was streaming into my room.