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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.
Passionate about all things Australian. Nocturnal signifies the group of animals that come out at night and sleep through the day (for example, an owl), as opposed to diurnal creatures who sleep at night and do their activities through the day. If it is referring to a plant, it is one that blooms or opens at night.oalas are nocturnal means that koalas are active at night, and  sleep during the day. The opposite of nocturnal is diurnal, meaning  active during the day. 2 people found this useful. Edit.