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English definition of “nocturnal”

nocturnal

adjective     /nɒkˈtɜː.nəl/ US  /nɑːkˈtɝː-/ formal
happening in or active during the night, or relating to the night: nocturnal wanderings nocturnal light Most bats are nocturnal. → Compare diurnalDays and times of day nocturnally     /-i/ adverb Days and times of day
(Definition of nocturnal adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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