the Week of Proper 21 / Ordinary 26
(a.) Appertaining to a decree; containing a decree; as, a decretal epistle.
(a.) An authoritative order or decree; especially, a letter of the pope, determining some point or question in ecclesiastical law. The decretals form the second part of the canon law.
(a.) The collection of ecclesiastical decrees and decisions made, by order of Gregory IX., in 1234, by St. Raymond of Pennafort.
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Webster, Noah. Entry for 'Decretal'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​d/decretal.html. 1828.