Meaning of “efficiency” in the English Dictionary

"efficiency" in British English

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efficiencynoun [ U ]

uk /ɪˈfɪʃ.ən.si/ us /ɪˈfɪʃ.ən.si/

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 Learner’s Dictionary & Thesaurus © Cambridge University Press)

"efficiency" in American English

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efficiencynoun [ C/U ]

us /ɪˈfɪʃ·ən·si/

the condition or fact of producing the results you want without waste, or a particular way in which this is done:

[ U ] The use of high-speed machinery improved the efficiency of the factory.
[ C usually pl ] They reduced costs through production efficiencies.

(Definition of “efficiency” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"efficiency" in Business English

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efficiencynoun

uk /ɪˈfɪʃənsi/ us

[ U ] a situation in which a person, company, factory, etc. uses resources such as time, materials, or labour well, without wasting any:

The company is looking to shed around 1,000 jobs as part of an efficiency drive.
achieve/boost/improve efficiency The company invested substantial amounts of money upgrading the plant, and its workers agreed to flexible work rules that boosted efficiency.
improved/increased/greater efficiency

[ U ] a situation in which a person, system, or machine works well and quickly:

improve/increase/maximize efficiency We are looking at ways to increase the efficiency of our advertising.
She does the job with great efficiency.

[ C or U ] PRODUCTION 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:

Burning wood on an open fire has efficiencies of only 15-20% compared to wood burning stoves, chip and pellet boilers with efficiencies of up to 80-90% .
efficiencies

[ plural ] ways of wasting less time, money, labour, etc.:

With the reorganisation, the company is aiming to achieve efficiencies in both production and marketing.

(Definition of “efficiency” from the Cambridge Business English Dictionary © Cambridge University Press)