noun
outside a room or building; outdoors
Refers to the area outside a specific enclosed space, such as a room, building, or vehicle. Often contrasted with 室内 (inside).
室外の気温は30度を超えている。
The temperature outside the building is over 30 degrees.
この部屋は室外の騒音がよく聞こえる。
In this room, you can clearly hear the noise from outside.