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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.
Nocturnality is a form of crypsis, an adaptation to avoid or enhance predation. One of the reasons that (cathemeral) lions prefer to hunt at night is that many of their prey species (zebra, antelope, impala, wildebeest, etc.) have poor night vision. Many species of small rodents are active at night because most of the dozen or so birds of prey that hunt them are diurnal.