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
Factory test results further strengthened the case, as Inlyte reported round-trip efficiency of 83%, including auxiliary loads, placing the system on par with high-end lithium-ion installations and well above the performance typically seen in many other long-duration energy storage technologies.
—
Bojan Stojkovski, Interesting Engineering, 13 Dec. 2025
Using dryer sheets for every load can affect the operating efficiency of your dryer.
—Mary Marlowe Leverette, Southern Living, 13 Dec. 2025
The Federal Aviation Administration (FAA) is working to overhaul the country's air traffic control system in an effort to reduce outages and improve efficiency.
—Evie Carrick, Travel + Leisure, 12 Dec. 2025
Fisch typically runs a pass-first offense, demanding high efficiency from his quarterbacks in a balanced spread offense.
—Shaun Goodwin, Idaho Statesman, 12 Dec. 2025
See All Example Sentences for efficiency
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Bojan Stojkovski, Interesting Engineering, 13 Dec. 2025
Using dryer sheets for every load can affect the operating efficiency of your dryer.
—Mary Marlowe Leverette, Southern Living, 13 Dec. 2025
The Federal Aviation Administration (FAA) is working to overhaul the country's air traffic control system in an effort to reduce outages and improve efficiency.
—Evie Carrick, Travel + Leisure, 12 Dec. 2025
Fisch typically runs a pass-first offense, demanding high efficiency from his quarterbacks in a balanced spread offense.
—Shaun Goodwin, Idaho Statesman, 12 Dec. 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 14 Dec. 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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