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

diurnal

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.

• (having a daily cycle) circadian (biology)

• (happening or active during the day) nocturnal, nightly
• (active or open during the day) nocturnal

• French: diurne
• German: tagaktiv
• Italian: diurno
• Portuguese: diurno
• Russian: дневно́й
• Spanish: diurno

• French: diurne
• Portuguese: diurno

• French: journalier
• Portuguese: diário

• French: journalier, quotidien
• German: täglich
• Portuguese: diário
• Russian: ежедне́вный

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.

• Italian: diurno, diurnale
• Portuguese: diurno