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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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 Their expertise helps prevent costly complications and improves the efficiency of our health-care system. — Arkansas Online, 5 Oct. 2026 Along with accelerating energy efficiency in homes and buildings, and increasing cleaner mobility, one of its strategies to get there is a three-year plan to divert 15% of waste from landfills. — ABC News, 5 Oct. 2026 Artificial intelligence can help by improving the efficiency and accuracy of statistical analysis. — Alexis Akwagyiram, semafor.com, 5 Oct. 2026 Homeowners can also discuss warranties, installation requirements, pricing and potential energy-efficiency benefits. — Samantha Agate, Miami Herald, 5 Oct. 2026 See All Example Sentences for efficiency

Recent Examples of Synonyms for efficiency

Noun

Immunity from flu vaccination is generally thought to last for around four to six months before losing some efficacy, according to the CDC.

— Stephen Underwood, Hartford Courant, 2 Oct. 2026
Those figures are based on efficacy analysis that assumes patients remained on treatment in the trial.

— Annika Kim Constantino, CNBC, 2 Oct. 2026

Definition of efficacy

Noun

The Policy Analysis Market (PAM) designed by Polk’s research firm, Net Exchange, for DARPA’s Information Awareness Office was one of many answers to questions raised about the effectiveness of US intelligence following 9/11.

— Simon Denny, Artforum, 1 Oct. 2026
Beauty’s average audience size declined 30% year over year, while content performance slipped 1%, suggesting that effectiveness increasingly depends on creator quality rather than quantity.

— Fernanda Tronco, Fortune, 1 Oct. 2026

Definition of effectiveness

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“Efficiency.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/efficiency. Accessed 9 Oct. 2026.

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Synonyms of efficiency

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