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English definition of “nocturnal”

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adjective uk   /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.
adverb uk   /-i/ us  
(Definition of nocturnal from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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