GNU Collaborative International Dictionary of English

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1.       
   ‖Cathedra , 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