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What does diurnal mean?

Looking for the meaning or definition of the word diurnal? Here's what it means.

Adjective
  1. Happening or occurring during daylight, or primarily active during that time.
  2. (botany) 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; circadian.
  4. (uncommon) Done once every day; daily, quotidian.
  5. (archaic) Published daily.
Noun
  1. A flower that opens only in the day.
  2. (Catholicism) A book containing canonical offices performed during the day, hence not matins.
  3. (archaic) A diary or journal.
  4. (archaic) A daily news publication.
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