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in the PONS Dictionary

efficiency [ɪˈfɪʃnsɪ] N no pl

1. efficiency (competence):

efficiency
уме́ние nt
efficiency
компете́нтность f
efficiency of a method
эффекти́вность f
efficiency of a method
результати́вность f
efficiency of a person
расторо́пность f
efficiency of a person
де́йственность f

2. efficiency TECH:

efficiency
коэффицие́нт m поле́зного де́йствия