chieflyRC Church the fourth of the seven canonical hours of the divine office or the prayers prescribed for it: originally the sixth hour of the day (noon)
[C15: from Church Latin sexta hōra the sixth hour]
Sext (sɛkst)
—n
RC Church In full: Liber Sextus an official compilation of decretals issued by Boniface VIII in 1298 to supplement the five books of the Liber Extra. It forms part of the Corpus Juris Canonici