Definition of ex cathedra adverb from the Oxford Advanced American Dictionary

 

ex cathedra

 adverb,adjective
adverb, adjective
NAmE//ˌɛks kəˈθidrə//
 
(formal)(religion)
 
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speaking with the authority of your position The Pope was speaking ex cathedra.
See the Oxford Advanced Learner's Dictionary entry: ex cathedra