/ Thesaurus / E Synonyms of encyclical letter Find synonyms for: Noun1. encyclical, encyclical letter, letter, missiveusage: a letter from the pope sent to all Roman Catholic bishops throughout the worldWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: denizen Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language