/ Thesaurus / E Synonyms of ex cathedra Find synonyms for: Adverb1. ex cathedrausage: with the full authority of the office; "the pope must speak ex cathedra for an encyclical to be infallible"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: pundit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language