All 3 Uses

ecclesiastical
in
Dante's Paradise -- translated by Norton
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[10] An act of treachery on the part of the Bishop and Lord of Feltro, Alessandro Novello, in delivering up Ghibelline exiles from Ferrara, of whom thirty were beheaded; a treason so vile that in the tower called Malta, where ecclesiastics who committed capital crimes were imprisoned, no such crime as his was ever punished†
Canto 1-11
[3] The books of the Ecclesiastical Law†
Canto 1-11 *

ecclesiastical = associated with a church
[5] Gratian was an Italian Benedictine monk, who lived in the 12th century, and compiled the famous work known as the Decretum Gratiani, composed of texts of Scripture, of the Canons of the Church, of Decretals of the Popes, and of extracts from the Fathers, designed to show the agreement of the civil and ecclesiastical law,—a work pleasing in Paradise because promoting concord between the two authorities†
Canto 1-11

Definitions:

(1) (ecclesiastical)
of or associated with a church -- especially a Christian Church
(2) (meaning too rare to warrant focus)