Diurnal

[adj] having a daily cycle or occurring every day; "diurnal rhythms"; "diurnal rotation of the heavens"; "the diurnal slumber of bats"
[adj] (biology) 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"

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Synonyms

cyclic, cyclical

Antonyms

nocturnal

Related Terms

annual, biannual, biennial, bimonthly, biweekly, catamenial, centenary, centennial, circadian, daily, daytime, decennial, everyday, fortnightly, hebdomadal, hourly, menstrual, momentary, momently, monthly, quarterly, quotidian, regular, secular, semestral