Breadcrumb Home > Thesaurus > E Synonyms of efficiency Find synonyms for: Noun 1. efficiency, ratio usage: the ratio of the output to the input of any system 2. efficiency, skillfulness usage: skillfulness in avoiding wasted time and effort; "she did the work with great efficiency" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of efficiency (Dictionary) ✖ Related Content Daily Word Quiz: umbrage Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language