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ENGLISH · A WORD WITH POSSIBILITIES

efficiency.

The extent to which a resource is used for the intended purpose.

10 characters4 syllables approx.English language

Meaning & usage

noun/ɪˈfɪʃ.ən.si/[ɪˈfɪʃn̩si]/ɪˈfɪʃ.ɪn.si/
  1. The extent to which a resource is used for the intended purpose.

    countable · uncountable
  2. The extent to which a resource is used for the intended purpose. The ratio of useful work to energy expended. Often given the symbol η.

    countable · uncountable
    The efficiency of this loudspeaker is 40%.
  3. The extent to which a resource is used for the intended purpose. The extent to which time is well used for the intended task.

    countable · uncountable
    The efficiency of the planning department is deplorable.
  4. The quality of producing an effect or effects.

    countable · dated · uncountable
  5. A one-room apartment.

    US · countable · uncountable
    I have an efficiency available June through July.
    fully-furnished efficiencies
Where this word comes from

From Latin efficientia, equivalent to efficient + -cy.

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.