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كفاءة (noun)
The ability to do something successfully or without waste. It refers to both human skills and machine performance.
"نعمل على تحسين كفاءة استخدام الطاقة."
Think of a CAFE (kafa) where the baristas work with high efficiency (ah). CAFE-AH = Kafa'ah = Efficiency.
Using كفاءة instead of فعالية when talking about whether a goal was achieved.
Spelling the word as كفائة instead of كفاءة.
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