also: エフィシエンシー
noun
Loanword from English; used in business, engineering, and everyday contexts to refer to the ratio of useful output to input, or the quality of being efficient.
このシステムのエフィシェンシーは非常に高い。
The efficiency of this system is very high.
エフィシェンシーを上げるために、工程を見直した。
We reviewed the process to improve efficiency.