canonical hour

noun

1. Ecclesiastical. 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.

noun

1. RC Church
   1. one of the seven prayer times appointed for each day by canon law
   2. the services prescribed for these times, namely matins, prime, terce, sext, nones, vespers, and compline
2. Church of England any time between 8:00 a.m. and 6:00 p.m. at which marriages may lawfully be celebrated