Definitions
1.AdjectiveHappening or occurring during daylight, or primarily active during that time."Most birds are diurnal."
2.AdjectiveSaid of a flower that is open, or releasing its perfume during daylight hours, but not at night.
3.AdjectiveHaving a daily cycle that is completed every 24 hours, usually referring to tasks, processes, tides, or sunrise to sunset; circadian.
4.AdjectiveDone once every day; daily, quotidian.
5.AdjectivePublished daily.
6.NounA flower that opens only in the day.
7.NounA book containing canonical offices performed during the day, hence not matins.
8.NounA diary or journal.
9.NounA daily news publication.