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
No new Nvidia laptop GPUs are expected, putting the spotlight on CPU performance and battery efficiency.
—
Jijo Malayil, Interesting Engineering, 5 Jan. 2026
Fossil’s focus on efficiency also has cut into its workforce with reductions earlier this year.
—Brian Womack, Dallas Morning News, 4 Jan. 2026
Is vinegar safe for high-efficiency washers?
—Ashlyn Needham, Southern Living, 4 Jan. 2026
Based on his optimistic outlook, Erickson raised his revenue and EBITDA (earnings before interest, taxes, depreciation, and amortization) estimates for 2026 and 2027, driven by higher AWS growth expectations and cost efficiencies.
—Tipranks.com Staff, CNBC, 4 Jan. 2026
See All Example Sentences for efficiency
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Jijo Malayil, Interesting Engineering, 5 Jan. 2026
Fossil’s focus on efficiency also has cut into its workforce with reductions earlier this year.
—Brian Womack, Dallas Morning News, 4 Jan. 2026
Is vinegar safe for high-efficiency washers?
—Ashlyn Needham, Southern Living, 4 Jan. 2026
Based on his optimistic outlook, Erickson raised his revenue and EBITDA (earnings before interest, taxes, depreciation, and amortization) estimates for 2026 and 2027, driven by higher AWS growth expectations and cost efficiencies.
—Tipranks.com Staff, CNBC, 4 Jan. 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 8 Jan. 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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