ex cathedraex ca·the·dra
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
Origin of ex cathedraModL, literally , from the chair from Classical Latin ex, from + cathedra, chair, especially of a teacher (in LL(Ec), of a bishop)
With the authority derived from one's office or position: the pope speaking ex cathedra; ex cathedra determinations.
Origin of ex cathedraLatin ex cathedrā ex from cathedrā ablative of cathedra chair