with the authority that comes from one's rank or office: often specif. with reference to papal pronouncements, on matters of faith or morals, that have authoritative finality
See ex cathedra in American Heritage Dictionary 4
(ĕksˌ kə-thēˈdrə)
adverb & adj.
With the authority derived from one's office or position: the pope speaking ex cathedra; ex cathedra determinations.