# efficiency

> English word · Noun · IPA /ɪˈfɪʃ.ən.si/ · frequency rank #3,749

## Definitions
1. The extent to which a resource is used for the intended purpose.
2. The extent to which a resource is used for the intended purpose.
3. The extent to which a resource is used for the intended purpose.
4. The quality of producing an effect or effects.
5. A one-room apartment.

## Etymology
From Latin efficientia, equivalent to efficient + -cy.

## Easily confused with
- **efficient** (https://plainspell.com/en/vs/efficiency-vs-efficient)
- **efficiently** (https://plainspell.com/en/vs/efficiency-vs-efficiently)

## Common misspellings (13)
`effciiency`, `efficciency`, `efficeincy`, `efficiecny`, `efficienccy`, `efficiencyy`, `efficienncy`, `efficienyc`, `efficinecy`, `effiicency`, `eficiency`, `efifciency`, `feficiency`

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/efficiency