EFFICIENCY Synonyms: 22 Similar and Opposite Words

efficiency

noun

i-ˈfi-shən-sē

Definition of efficiency

as in efficacy

the power to produce a desired result the proven efficiency of meditation in reducing stress within the company's workforce

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Example Sentences

Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.

Recent Examples of efficiency The system is designed to improve efficiency while helping maintain stable performance after the facility enters service. — Sujita Sinha, Interesting Engineering, 10 Aug. 2026 Boards are leaning heavily toward C-suite consolidation to drive capital efficiency and tighter data integration, and an experienced CFO can absorb operational frameworks through the lens of resource allocation. — Sheryl Estrada, Fortune, 10 Aug. 2026 The challenge is that the laser may heat the receiver to temperatures as high as 80-90 °C (176-194 °F), which affects charging efficiency and can eventually damage the drone. — Maryna Holovnova, New Atlas, 9 Aug. 2026 By focusing on the lowest-cost and fastest deployable solutions, including renewables, energy storage, VPPs and energy efficiency, Illinois’ actions outpace those of other states in PJM’s footprint. — Chicago Tribune, 9 Aug. 2026 See All Example Sentences for efficiency

Recent Examples of Synonyms for efficiency

Noun

Ferulic acid, for its part, can help boost their stability and efficacy—which in sum made the formula more powerful than most antioxidant serums.

— Deanna Pai, Vogue, 7 Aug. 2026
But researchers cautioned that the drug’s efficacy has not yet been proven.

— The New Yorker, New Yorker, 7 Aug. 2026

Definition of efficacy

Noun

How closely matched the flu vaccine is to the dominant strain of the season is part of what accounts for the year-to-year changes in the shot’s effectiveness.

— Elise Haulund, CNN Money, 14 Aug. 2026
Because supplements don't have to undergo FDA approval for safety or effectiveness before being sold, Wood also recommends looking for products independently tested by a reputable third party.

— Dr. Onaola Adedeji, ABC News, 13 Aug. 2026