This is the 4637th most frequent Arabic word.
اختفاء
Disappearance.
In this sentence, the word 'اختفاء' (disappearance) describes the event of the sun becoming hidden or not visible due to the clouds.
اختفاء الشمس وراء الغيوم جعل الجو مظلماً.
The sun disappearing behind the clouds made the atmosphere dark.
Here, 'اختفاء' (disappearance) indicates the event of the books no longer being present or available in the library.
أثرت في مسألة اختفاء الكتب من المكتبة.
I was affected by the matter of books disappearing from the library.
In this sentence, 'اختفاء' (disappearance) refers to the cessation or vanishing of the sound unexpectedly during the lecture.