efficiency
noun
ef·fi·cien·cy
i-ˈfi-shən-sē 
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
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
The Knights struggled to maintain their early efficiency with Prince avoiding foul trouble in the second half.
—
Steven Johnson, Fort Worth Star-Telegram, 22 Mar. 2025
Programs such as Lean Six Sigma have been successfully implemented by many Fortune 500 companies to improve operational efficiency.
—Chicago Tribune, 21 Mar. 2025
This significantly lowers the barrier for cyberattacks and increases the speed and efficiency of data theft—sometimes in minutes, before security teams even detect an intrusion.
3.
—Keren Katz, Forbes, 21 Mar. 2025
Robert Morris shot just 42 percent, relying more on extra shots (78-58 advantage) rather than efficiency, and only managed eight free throws on 13 attempts (62%).
—Thomas G. Moukawsher, Newsweek, 21 Mar. 2025
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Cite this Entry
“Efficiency.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/efficiency. Accessed 28 Mar. 2025.
Kids Definition
efficiency
noun
ef·fi·cien·cy
i-ˈfish-ən-sē
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
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