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

1.
piano terra
the floor of a building that is at the same level as the ground outside
:
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The reception area is on the ground floor.
L'area della reception si trova al piano terra.
•
Our apartment is on the ground floor, so it's easy to access.
Il nostro appartamento è al piano terra, quindi è facile da raggiungere.