Added 9 October 2026
efficiency
/ɪˈfɪʃ.ən.si/ noun
In Latin: efficientia Wiktionary
noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about efficiency at Wordnik → Where our words come from →
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The extent to which a resource is used for the intended purpose.
The efficiency of this loudspeaker is 40%.
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The ratio of useful work to energy expended. Often given the symbol η.
The efficiency of this loudspeaker is 40%.
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The extent to which time is well used for the intended task.
The efficiency of the planning department is deplorable.
Origin
From Latin efficientia, equivalent to efficient + -cy.
From Wiktionary, via Kaikki.org (CC BY-SA)