/ Thesaurus / P Synonyms of proprietorship Find synonyms for: Noun1. proprietorship, proprietary, ownershipusage: an unincorporated business owned by a single person who is responsible for its liabilities and entitled to its profitsWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: bibliophile Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language