a. Obs. rare. [ad. Gr. ἐξουσιαστικ-ός, f. ἐξουσιάζειν to exercise authority, f. ἐξουσία authority.] Of or pertaining to authority; authoritative.

1

1688.  Renwick, Serm. (1777), 539. The exousiastick [printed exau-] power of trying, sending and authorising office-bearers in the church, is made useless and void. Ibid., 568.

2