/ Thesaurus / C Synonyms of cost plus Find synonyms for: Adjective1. cost-plus, indeterminate (vs. determinate), undeterminedusage: determining payment based on the actual cost of production plus an agreed-upon fee or rate of profit; "a cost-plus government contract"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language