n. 1 effectiveness, efficacy, competence, capability, adeptness, proficiency, expertness, expertise, know-how, experience, skill, skilfulness, dexterity, adroitness The efficiency of the staff has been greatly improved 2 productivity, effectiveness, efficaciousness: How does the efficiency of a diesel compare with that of other engines?
EFFICIENCY
Meaning of EFFICIENCY in English
Oxford thesaurus English vocab. Английский словарь Оксфорд тезаурус. 2012