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 commission said the decision is meant to enhance player engagement, improve services and protect both efficiency and data security.
—
James Powel, USA Today, 14 June 2025
At its core, this shift reframes bioenergetics as leadership currency: a founder's ability to perform under pressure, think clearly and lead with emotional resilience is directly tied to cellular efficiency.
—Ximena Araya-Fischel, Forbes.com, 14 June 2025
But in the fleet, pacey manner of the editing, toggling between private and public moments with highlight-reel efficiency, the film is a stirring glimpse of top-down kindness as a winning leadership style.
—Robert Abele, Los Angeles Times, 13 June 2025
Depending on the altitude, fuel, and engine efficiency pre jet planes sometimes did leave contrails.
—Ticked Off, The Orlando Sentinel, 13 June 2025
See All Example Sentences for efficiency
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James Powel, USA Today, 14 June 2025
At its core, this shift reframes bioenergetics as leadership currency: a founder's ability to perform under pressure, think clearly and lead with emotional resilience is directly tied to cellular efficiency.
—Ximena Araya-Fischel, Forbes.com, 14 June 2025
But in the fleet, pacey manner of the editing, toggling between private and public moments with highlight-reel efficiency, the film is a stirring glimpse of top-down kindness as a winning leadership style.
—Robert Abele, Los Angeles Times, 13 June 2025
Depending on the altitude, fuel, and engine efficiency pre jet planes sometimes did leave contrails.
—Ticked Off, The Orlando Sentinel, 13 June 2025
See All Example Sentences for efficiency
Cite this Entry
“Efficiency.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/efficiency. Accessed 18 Jun. 2025.
Copy CitationKids 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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