Meaning of “nocturnal” in the English Dictionary

"nocturnal" in British English

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nocturnaladjective

uk /nɒkˈtɜː.nəl/ us /nɑːkˈtɝː.nəl/ formal

happening in or active during the night, or relating to the night:

nocturnal wanderings
nocturnal light
Most bats are nocturnal.
Compare
nocturnally
adverb uk /nɒkˈtɜː.nəl.i/ us /nɑːkˈtɝː.nəl.i/

(Definition of “nocturnal” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"nocturnal" in American English

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nocturnaladjective

us /nɑkˈtɜr·nəl/

of the night, or active during the night:

Most bats and owls are nocturnal.

(Definition of “nocturnal” from the Cambridge Academic Content Dictionary © Cambridge University Press)