What is Capitulary?

Legal Definition
A capitulary (medieval Latin capitularium) was a series of legislative or administrative acts emanating from the Frankish court of the Merovingian and Carolingian dynasties, especially that of the first emperor of the Romans in the west since the deposition of Romulus Augustulus, Charlemagne. They were so called because they were formally divided into sections called capitula (plural of capitulum, a diminutive of caput meaning "head(ing)", i.e. chapters).

As soon as the capitulary was composed, it was sent to the various functionaries of the Frankish empire, archbishops, bishops, missi dominici and counts, a copy being kept by the chancellor in the archives of the palace. The last emperor to compose capitularies was Lambert in 898.
-- Wikipedia
Legal Definition
In French law. A collection and code of the laws and ordinances promulgated by the kings of the Merovingian and Carlovingian dynasties. Any orderly and systematic collection or code of laws. In ecclesiastical law. A collection of laws and ordinances orderly arranged by divisions. A book containing the beginning and end of each Gospel which is to be read every day in the ceremony of saying mass. Du Cange.
-- Black's Law Dictionary
Legal Definition
Same as Capitular.
-- Ballentine's Law Dictionary