AskDefine | Define diurnal

Dictionary Definition

diurnal adj
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"

User Contributed Dictionary




  1. A flower that opens only in the day
  2. A book containing canonical offices but not matins
  3. A diary or journal.
  4. A daily news publication.



  1. Occurring daily
  2. Primarily active during the day.
  3. Open during daylight hours, closed at night
  4. 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.



Extensive Definition

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
In astrology:
  • Diurnal chart, a chart for a given date, based on the natal chart
  • Diurnal planet, a planet in a sect for which the Sun is above the horizon
  • Diurnal sign, a sign in the zodiac whose natural positions are on the southern hemisphere of the horoscope
In astronomy:
  • 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

Synonyms, Antonyms and Related Words

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