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Definition of Diurnal
1. Adjective. Of or belonging to or active during the day. "Diurnal and nocturnal offices"
2. Adjective. Having a daily cycle or occurring every day. "Diurnal rotation of the heavens"
Definition of Diurnal
1. a. Relating to the daytime; belonging to the period of daylight, distinguished from the night; -- opposed to nocturnal; as, diurnal heat; diurnal hours.
2. n. A daybook; a journal.
Definition of Diurnal
1. Adjective. Happening or occurring during daylight, or primarily active during that time. ¹
2. Adjective. (botany) Said of a flower open, or releasing its perfume during daylight hours, but not at night. ¹
3. Adjective. Having a daily cycle that is completed every 24 hours, usually referring to tasks, processes, tides, or sunrise to sunset. ¹
4. Adjective. (uncommon) Done once every day; daily, quotidian. ¹
5. Adjective. (archaic) Published daily. ¹
6. Noun. A flower that opens only in the day. ¹
7. Noun. (context: Catholicism) A book containing canonical offices performed during the day, hence not matins. ¹
8. Noun. (archaic) A diary or journal. ¹
9. Noun. (archaic) A daily news publication. ¹
¹ Source: wiktionary.com
Definition of Diurnal
1. a diary [n -S] - See also: diary
Medical Definition of Diurnal
1. Occurring during the day. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)