ground floor
US /ˈɡraʊnd flɔːr/
UK /ˈɡraʊnd flɔːr/

1.
1階, 地上階
the floor of a building that is at the same level as the ground outside
:
•
The reception area is on the ground floor.
受付は1階にあります。
•
Our apartment is on the ground floor, so it's easy to access.
私たちのアパートは1階にあるので、アクセスしやすいです。