/ Thesaurus / T Synonyms of tjalling charles koopmans Find synonyms for: Noun1. Koopmans, Tjalling Koopmans, Tjalling Charles Koopmansusage: United States economist (born in the Netherlands) (1910-1985)WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: ravenous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language