'Ex cathedra' definitions:
Definition of 'ex cathedra'
From: WordNet
adverb
With the full authority of the office; "the pope must speak ex cathedra for an encyclical to be infallible"
Definition of 'Ex cathedra'
From: GCIDE
- Cathedra \Cath"e*dra\, n. [L., fr. Gr. ? seat. See Chair.] The official chair or throne of a bishop, or of any person in high authority. [1913 Webster]
- Ex cathedra [L., from the chair], in the exercise of one's office; with authority. [1913 Webster]
- The Vatican Council declares that the Pope, is infallible "when he speaks ex cathedra." --Addis & Arnold's Cath. Dict. [1913 Webster]