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The Collaborative International Dictionary
Dicastery

Dicastery \Di*cas"ter*y\, n. [Gr. ?, fr. ? juryman. See Dicast.] A court of justice; judgment hall. [R.]
--J. S. Mill.

Wiktionary
dicastery

n. 1 A term used by the Vatican corresponding to ministry or department as subdivisions of the papal curia, referring to the administrative departments of the Vatican City State, as well as strictly ecclesiastical departments; more often termed congregation. 2 A judicial body of the ancient Athenian state, made up of dicasts.

Wikipedia
Dicastery

Dicastery (from Greek δικαστήριον, law-court, from δικαστής, judge/juror) is an Italicism that properly denotes the departments of the Roman Curia.