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
This physical barrier is crucial for suppressing the decomposition of water, a primary cause of gas formation and efficiency loss in aqueous systems.
—
Aman Tripathi, Interesting Engineering, 27 Sep. 2025
Earlier this month, Salesforce CEO Marc Benioff said the company cut 4,000 customer support jobs this year due to efficiency gains directly linked to AI technology.
—Preston Fore, Fortune, 27 Sep. 2025
When your adductors can’t adequately support your pelvis, this entire system becomes compromised, leading to compensations that can create lower back tension and reduced movement efficiency.
—Dana Santas, CNN Money, 26 Sep. 2025
Chain operators dominate stalls once run by families, and many dishes are perfected for efficiency rather than charm or character.
—Clarissa Wei, Travel + Leisure, 26 Sep. 2025
See All Example Sentences for efficiency
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Aman Tripathi, Interesting Engineering, 27 Sep. 2025
Earlier this month, Salesforce CEO Marc Benioff said the company cut 4,000 customer support jobs this year due to efficiency gains directly linked to AI technology.
—Preston Fore, Fortune, 27 Sep. 2025
When your adductors can’t adequately support your pelvis, this entire system becomes compromised, leading to compensations that can create lower back tension and reduced movement efficiency.
—Dana Santas, CNN Money, 26 Sep. 2025
Chain operators dominate stalls once run by families, and many dishes are perfected for efficiency rather than charm or character.
—Clarissa Wei, Travel + Leisure, 26 Sep. 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 2 Oct. 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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