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فعالية (noun)
The degree to which something is successful in producing a desired result. It can also refer to an event or activity.
"تم إثبات فعالية اللقاح الجديد."
Imagine a FAst ALI (فعالي) organizing an EVENT that is highly EFFECTIVE.
Using فعالية when meaning كفاءة (efficiency).
Saying فعالية المهرجان (singular) instead of فعاليات المهرجان (plural) for a multi-day festival.
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