efficiency

noun
ef·​fi·​cien·​cy | \ i-ˈfi-shən-sē How to pronounce efficiency (audio) \
plural efficiencies

Definition of efficiency

1 : the quality or degree of being efficient
2a : efficient operation
b(1) : effective operation as measured by a comparison of production with cost (as in energy, time, and money)
(2) : the ratio of the useful energy delivered by a dynamic system to the energy supplied to it

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Examples of efficiency in a Sentence

Because of her efficiency, we got all the work done in a few hours. The factory was operating at peak efficiency. A furnace with 80 percent fuel efficiency wastes 20 percent of its fuel. The company is trying to lower costs and improve efficiencies.
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Recent Examples on the Web Speaking of records, Slovis’ 167.6 passing efficiency rating was the highest in USC history. Jeremy Cluff, The Arizona Republic, "USC's Kedon Slovis receiving rave reviews ahead of 2020 college football season," 31 July 2020 Standard active grille shutters will boost fuel efficiency, and an active front air dam will lower at 40 mph, retracting partially at lower speeds and completely for off-roading. cleveland, "2021 Ford F-150 features and tech aim to delight owners and stump the competition," 4 July 2020 This analysis is mostly based on stimulus packages delivered in the last financial crisis, which fed into high-speed train rollouts in China and building-efficiency programs in Europe, Canada, and Australia. David Meyer, Fortune, "Airline bailouts highlight the debate over how green the coronavirus recovery should be," 27 June 2020 This is where an SSTO rocket with air-breathing engines would provide a huge efficiency boost. Daniel Oberhaus, Ars Technica, "The rocket motor of the future “breathes” air like a jet engine," 27 June 2020 Standard active grille shutters will boost fuel efficiency, and an active front air dam will lower at 40 mph, retracting partially at lower speeds and completely for off-roading. Mark Phelan, Detroit Free Press, "2021 Ford F-150 features and tech aim to delight owners and stump the competition," 26 June 2020 Most of those polled also support tougher restrictions on power plant emissions (80%), imposing a carbon tax on businesses (73%), and tougher fuel-efficiency standards for cars and trucks (71%). Josh Siegel, Washington Examiner, "Daily on Energy, presented by API: New polling on Republicans and climate change," 24 June 2020 Notre Dame is the only one of 130 schools to rank in the top six nationally in pass-efficiency defense each of the past two seasons. Eric Hansen, The Indianapolis Star, "As Notre Dame's workouts begin, here's a stab at Brian Kelly's to-do list," 23 June 2020 The 2020 Rogue has an EPA fuel efficiency rating of 26 mpg in the city and 33 on the highway. Jeff Yip, Houston Chronicle, "2021 Nissan Rogue gets makeover, tech updates," 16 June 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'efficiency.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of efficiency

1633, in the meaning defined at sense 1

History and Etymology for efficiency

borrowed from Latin efficientia, from efficient-, efficiens "producing or giving rise to something, immediate (of a cause), efficient" + -ia -y entry 2

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Time Traveler for efficiency

Time Traveler

The first known use of efficiency was in 1633

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Statistics for efficiency

Last Updated

6 Aug 2020

Cite this Entry

“Efficiency.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/efficiency. Accessed 14 Aug. 2020.

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More Definitions for efficiency

efficiency

noun
How to pronounce efficiency (audio)

English Language Learners Definition of efficiency

: the ability to do something or produce something without wasting materials, time, or energy : the quality or degree of being efficient

efficiency

noun
ef·​fi·​cien·​cy | \ i-ˈfi-shən-sē How to pronounce efficiency (audio) \
plural efficiencies

Kids Definition of efficiency

: the ability to do something or produce something without waste

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Comments on efficiency

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