Etymology
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nocturnal (adj.)

"of or pertaining to the night, used or done at night," late 15c. (Caxton), from Old French nocturnal "nightly, nocturnal," or directly from Late Latin nocturnalis, from Latin nocturnus "belonging to the night," from nox (genitive noctis) "night," cognate with Old English neaht (see night) + -urnus, suffix forming adjectives of time. Related: Nocturnally. Nocturnal emission "involuntary ejaculation during sleep" is recorded by 1813.

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Definitions of nocturnal

nocturnal (adj.)
belonging to or active during the night;
nocturnal plants have flowers that open at night and close by day
nocturnal animals are active at night
nocturnal (adj.)
of or relating to or occurring in the night;
nocturnal darkness
From wordnet.princeton.edu