semidarkness

/ˌsɛmiˈdɑrknəs/
noun
  1. A state or condition of being partly dark; dim light; twilight or shadow.
    • The cat's eyes glowed in the semidarkness of the basement.
    • They walked through the semidarkness of the forest just before dawn.
    • In the semidarkness of the old library, she could barely make out the titles on the shelves.
Antonyms
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