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.

Laboratory tests showed that the material maintained its performance through 30 cycles of carbon capture and release, with no major loss of efficiency.

From Science Daily • Jun. 11, 2026

DS Smith said the proposal followed "a review of UK packaging operations" and was linked to "tough trading conditions" as it looked to "improve efficiency and respond to changing customer demand".

From BBC • Jun. 11, 2026

There are two ways to look at water risk he says, de-risking or seeking companies focused on water efficiency.

From Barron's • Jun. 10, 2026

The bank expects a leaner Porsche to emerge after years of half-hearted efficiency measures.

From The Wall Street Journal • Jun. 9, 2026

Hill jumped on every chance to bend the ear of the industrialists, explaining why promotion of blacks to foremen would reduce conflict and increase efficiency.

From "A Few Red Drops: The Chicago Race Riot of 1919" by Claire Hartfield

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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