Meaning of “diurnal” in the English Dictionary

"diurnal" in British English

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diurnaladjective

uk /ˌdaɪˈɜː.nəl/ us /ˌdaɪˈɝː.nəl/ specialized

happening over a period of a day, or being active or happening during the day rather than at night

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diurnally
adverb uk /ˌdaɪˈɜː.nəl.i/ us /ˌdaɪˈɝː.nəl.i/

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