Diurnal

Adjective

 * 1) Happening or occurring during daylight, or primarily active during that time.
 * Most birds are diurnal.
 * 1)  Said of a flower open, or releasing its perfume during daylight hours, but not at night.
 * 2) Having a daily cycle that is completed every 24 hours, usually referring to tasks, processes, tides, or sunrise to sunset.
 * 3)  Done once every day; daily, quotidian.
 * 4)  Published daily.

Synonyms

 * circadian

Antonyms

 * nocturnal, nightly
 * nocturnal

Coordinate terms

 * crepuscular

Noun

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

Thesaurus
annual, biannual, biennial, bimonthly, biweekly, catamenial, centenary, centennial, circadian, daily, daytime, decennial, everyday, fortnightly, hebdomadal, hourly, menstrual, momentary, momently, monthly, quarterly, quotidian, regular, secular, semestral, semiannual, semimonthly, semiweekly, semiyearly, tertian, triennial, weekly, yearly