Breadcrumb Home > Thesaurus > O Synonyms of outbuilding Find synonyms for: Noun1. outbuilding, building, edificeusage: a building that is subordinate to and separate from a main buildingWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of outbuilding (Dictionary) ✖ Related Content Daily Word Quiz: sophism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language