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English definition of “efficiency”

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efficiency

noun [U] uk   /ɪˈfɪʃ.ən.si/ us  
B2 the good use of time and energy in a way that does not waste any: What is so impressive about their society is the efficiency of the public services. energy efficiency 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 movement
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(Definition of efficiency from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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