Definitions for canonical hour
Random House Webster's College Dictionary
any of certain periods of the day set apart for prayer and devotion: these are matins and lauds, prime, tierce, sext, nones, vespers, and compline.
Origin of canonical hour:
(Roman Catholic Church) one of seven specified times for prayer
Any of certain times of day at which specified prayers are said according to canon law
The prayers said at these times
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