• (British) IPA: /daɪˈɜːnəɫ/
  • (America) IPA: /daɪˈɝ.nəl/


  1. Happening or occurring during daylight, or primarily active during that time.
    Most birds are diurnal.
    • 1972, Laurence Monroe Klauber, Rattlesnakes: Their Habits, Life Histories, and Influence on Mankind, Volume 1 ↗
      However, in general, lizards are more diurnal than rattlers, which may be one of the reasons why young rattlers are more diurnal than adults.
    • c. 1604–1605, William Shakespeare, “All’s VVell, that Ends VVell”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: Printed by Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358 ↗, [Act II, scene v]:
      Ere twice the horses of the sun shall bring / Their fiery torcher his diurnal ring.
  2. (botany) Said of a flower open, or releasing its perfume during daylight hours, but not at night.
  3. Having a daily cycle that is completed every 24 hours, usually referring to tasks, processes, tides, or sunrise to sunset; circadian.
  4. (uncommon) Done once every day; daily, quotidian.
  5. (archaic) Published daily.
Synonyms Antonyms Translations Translations Translations Translations Noun

diurnal (plural diurnals)

  1. A flower that opens only in the day.
  2. (Catholicism) A book containing canonical offices performed during the day, hence not matins.
  3. (archaic) A diary or journal.
  4. (archaic) A daily news publication.

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