Definitions

efficiency

[ih-fish-uhn-see] / ɪˈfɪʃ ən si /

NOUN

adeptness, effectiveness

Synonyms

STRONGEST

ability adaptability capability competence energy expertise performance productivity readiness skill talent

STRONG

abundance address adequacy capableness competency completeness economy effectualness efficacy facility faculty know-how potency power powerfulness productiveness proficiency prowess quantity resourcefulness response skillfulness suitability suitableness thoroughness

Antonyms

STRONGEST

idleness ignorance impotence inability inadequacy incapability incapacity incompetence ineptness weakness

STRONG

inefficiency lack

WEAK

helplessness ineffectiveness

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

By measuring the generated thrust and operating the thrusters continuously for periods of up to 100 hours, the team was able to assess the fuel's performance and efficiency.

From Science Daily • Jun. 10, 2026

Several companies are focused on water efficiency, including in agriculture.

From Barron's • Jun. 10, 2026

To understand what is at stake, one must look at the profound and broad economic impact of rail efficiency.

From MarketWatch • Jun. 9, 2026

On Friday, they made 15 3-pointers to the Spurs’ 11, while shooting a higher efficiency from beyond the arc.

From The Wall Street Journal • Jun. 7, 2026

The efficiency of it took Dicey’s breath away.

From "Homecoming" by Cynthia Voigt

Vocabulary lists containing efficiency

Word Generation Science - Energy

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"The Veldt" by Ray Bradbury

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The Boy in the Striped Pajamas

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