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.


  1. Happening or occurring during daylight, or primarily active during that time.
    Most birds are diurnal.
  2. 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.
  4. Done once every day; daily, quotidian.
  5. Published daily.

The above text is a snippet from Wiktionary: diurnal
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