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Princeton's WordNet (0.00 / 0 votes) Rate this definition: nocturnal (adj). belonging to or active during the night. nocturnal animals are active at night; nocturnal plants have flowers that open at night and close by day. nocturnal (adj). of or relating to or occurring in the night. nocturnal darkness.
Owls are well known for being nocturnal, but some owls are active during the day. Nocturnality is an animal behavior characterized by activity during the night and sleeping during the day. The common adjective is nocturnal, versus diurnal meaning the opposite.