efficiency

noun

ef·​fi·​cien·​cy i-ˈfi-shən-sē How to pronounce efficiency (audio)
plural efficiencies
1
: the quality or degree of being efficient
2
a
: 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
3

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.
Recent Examples on the Web And for the first time this season (and in many seasons), they are ranked higher in offensive efficiency (22) than defensive efficiency (25) ... Mark Zeigler, San Diego Union-Tribune, 20 Nov. 2023 Electricity use grew rapidly in rich countries like the United States and many European nations during the previous century, but started to plateau or even decline in the 2000s largely thanks to improved energy efficiency, as well as the outsourcing of heavy industries. Nadja Popovich, New York Times, 20 Nov. 2023 Some robots can run, jump, or dance with greater efficiency than humans, but their body movements also seem mechanical. Rupendra Brahambhatt, Ars Technica, 18 Nov. 2023 Peter Henderson, an incoming computer science and public affairs professor at Princeton University, is impressed with the efficiency gains AI has seen, especially with the ability of hardware to run programs more locally, which requires less energy. Yessenia Funes, The Verge, 17 Nov. 2023 Without the capability to offer such efficiencies, these businesses risk being excluded. Manoj Chaudhary, Forbes, 13 Nov. 2023 Future investments will include improvements to energy efficiency to bring the asset up to BREEAM excellent standards. Mark Faithfull, Forbes, 13 Nov. 2023 Among other things, energy efficiency encourages individuality: because a human brain can run on oatmeal, the world can support billions of brains, all different. Joshua Rothman, The New Yorker, 13 Nov. 2023 But the newest version of the largest home console in decades isn't a straightforward improvement in efficiency, at least as seen by Dave2D and Linus Tech Tips. Kevin Purdy, Ars Technica, 7 Nov. 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'efficiency.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

Etymology

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

First Known Use

1633, in the meaning defined at sense 1

Time Traveler
The first known use of efficiency was in 1633

Dictionary Entries Near efficiency

Cite this Entry

“Efficiency.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/efficiency. Accessed 29 Nov. 2023.

Kids Definition

efficiency

noun
ef·​fi·​cien·​cy i-ˈfish-ən-sē How to pronounce efficiency (audio)
plural efficiencies
1
: the quality or degree of being efficient
2
: efficient operation
3
: the ratio of the useful energy delivered by a machine to the energy supplied to it

More from Merriam-Webster on efficiency

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