Definition of ex cathedra adverb from the Oxford Advanced Learner's Dictionary

 

ex cathedra

 adverb,adjective
adverb, adjective
BrE BrE//ˌeks kəˈθiːdrə//
 
; NAmE NAmE//ˌeks kəˈθiːdrə//
 
(formal, religion)
 
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speaking with the authority of your position The Pope was speaking ex cathedra. Word OriginLatin, ‘from the (teacher's) chair’, from ex ‘from’ and cathedra ‘seat’ (from Greek kathedra).
See the Oxford Advanced American Dictionary entry: ex cathedra