Efficiency
来自Big Physics
Safin（讨论 | 贡献）2022年4月27日 (三) 03:44的版本 （建立内容为“Category:etymology == google == [https://www.google.com.hk/search?q=efficiency+etymology&newwindow=1&hl=en ref] late 16th century (in the sense ‘the fact o…”的新页面）
late 16th century (in the sense ‘the fact of being an efficient cause’): from Latin efficientia, from efficere ‘accomplish’ (see effect).
wiktionary
From Latin efficientia.
etymonline
efficiency (n.)
1590s, "power to accomplish something," from Latin efficientia "efficient power; efficiency; influence" (from efficientem; see efficient) + -cy. In mechanics, "ratio of useful work done to energy expended," from 1858. Attested by 1951 as short for efficiency apartment (itself from 1917).
