1. Relating to or occurring in a 24-hour period; daily.
2. Occurring or active during the daytime rather than at night: diurnal animals.
3. Botany. Opening during daylight hours and closing at night.
1. A book containing all the offices for the daily canonical hours of prayer except matins.
1. A diary or journal.
2. A daily newspaper.
[Middle English, from Late Latin diurnālis, from Latin diurnus, from diēs, day.]
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