1 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" [ant: nocturnal]
2 having a daily cycle or occurring every day; "diurnal rhythms"; "diurnal rotation of the heavens"; "the diurnal slumber of bats"
- Rhymes: -ɜː(r)nəl
- Occurring daily
- Primarily active during the day.
- Open during daylight hours, closed at night
- Repeated or recurring daily. Having a daily cycle of completed actions in 24 hours and recurring every 24 hours. Thus, most reference is made to diurnal tasks, cycles, tides, or sunrise to sunset.
Diurnal ("daily") may refer to:
- Diurnality, the behavior of an animal that is active in the daytime
- Actions which are completed in 24 hours and are repeated every 24 hours, e.g. the sun reaching its zenith.
- Diurnal motion, the apparent motion of stars around the Earth, caused by the Earth's rotation around its axis. More generally it means repeating daily as in e.g. diurnal effect
- Diurnal phase shift, the phase shift of electromagnetic signals associated with daily changes in the ionosphere
- Diurnal temperature variation, the daily temperature shift that occurs from daytime to night
- Diurnal arc, the time, as expressed in right ascension, it takes a planet, point, or degree to move from its rising point to its setting point
diurnal in Spanish: Diurnal
diurnal in French: Diurne
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, semiannual, semimonthly, semiweekly, semiyearly, tertian, triennial, weekly, yearly