This is the 281st most frequent Arabic word.
الداخلية
"الداخلية" means "the interior" or "internal affairs."
Here, "الداخلية" refers to the governmental department responsible for internal affairs.
أشرفت وزارة الداخلية على تنظيم الانتخابات.
The Ministry of Interior supervised the organization of the elections.
In this sentence, "الداخلية" describes walls located inside a room, indicating the interior aspect.
علينا إعادة طلاء الجدران الداخلية للغرفة.
We need to repaint the interior walls of the room.
Here, "الداخلية" is used to describe something that is internal to an object, in this case, the body.