first floor
US /ˌfɜːrst ˈflɔːr/
UK /ˌfɜːrst ˈflɔːr/

1.
eerste verdieping
the floor of a building at ground level or immediately above the ground floor
:
•
The office is on the first floor.
Het kantoor bevindt zich op de eerste verdieping.
•
Take the elevator to the first floor.
Neem de lift naar de eerste verdieping.