Definitions from Wiktionary (diurnal)

▸ adjective:  Happening or occurring during daylight, or primarily active during that time.
▸ adjective:  (botany) Said of a flower that is open, or releasing its perfume during daylight hours, but not at night.
▸ adjective:  Having a daily cycle that is completed every 24 hours, usually referring to tasks, processes, tides, or sunrise to sunset; circadian.
▸ adjective:  (uncommon) Done once every day; daily, quotidian.
▸ adjective:  (archaic) Published daily.
▸ noun:  A flower that opens only in the day.
▸ noun:  (Catholicism) A book containing canonical offices performed during the day, hence not matins.
▸ noun:  (archaic) A diary or journal.
▸ noun:  (archaic) A daily news publication.
▸ Also see diurnal



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