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
On the Tirranna, the single-wing setup aims to deliver a fuel efficiency improvement of roughly 10%.
—
Aman Tripathi,
Interesting Engineering,
3 July 2026
The efficiency comes from the engine mechanics itself – not a higher octane level.
—
David Goldman,
CNN Money,
3 July 2026
As competitors down dogs for ten straight minutes with a ravenous efficiency that feels worlds apart from snacking on a frank at the ballpark, eating escalates into an élite physical spectacle nearing performance art.
—
Sheldon Pearce,
New Yorker,
3 July 2026
That meant the design had to favor stability and efficiency, almost like a giant paper glider.
—
New Atlas,
3 July 2026
See All Example Sentences for efficiency
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Aman Tripathi,
Interesting Engineering,
3 July 2026
The efficiency comes from the engine mechanics itself – not a higher octane level.
—
David Goldman,
CNN Money,
3 July 2026
As competitors down dogs for ten straight minutes with a ravenous efficiency that feels worlds apart from snacking on a frank at the ballpark, eating escalates into an élite physical spectacle nearing performance art.
—
Sheldon Pearce,
New Yorker,
3 July 2026
That meant the design had to favor stability and efficiency, almost like a giant paper glider.
—
New Atlas,
3 July 2026
See All Example Sentences for efficiency
Cite this Entry
“Efficiency.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/efficiency. Accessed 5 Jul. 2026.
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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