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English definition of “efficiency”

efficiency

noun [U] uk   /ɪˈfɪʃ.ən.si/ us  
B2 the use of time and energy in a good way, without wasting any: What is so impressive about their society is the efficiency of the public services. energy efficiencyEfficient and effective specialized physics the difference between the amount of energy that is put into a machine in the form of fuel, effort, etc. and the amount that comes out of it in the form of movementEfficient and effective
(Definition of efficiency from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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