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Open English Wordnet
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Adjectives
(a)
diurnal
of or belonging to or active during the day
“diurnal animals are active during the day”
,
“diurnal flowers are open during the day and closed at night”
,
“diurnal and nocturnal offices”
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(s)
diurnal
having a daily cycle or occurring every day
“diurnal rotation of the heavens”
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