das Erdgeschoss
ground floor
The floor of a building that is at the level of the surrounding ground or street.
Die Wohnung im Erdgeschoss hat einen direkten Zugang zum Garten.
The apartment on the ground floor has direct access to the garden.

ground floor
Loading your saved state.
ground floor
The floor of a building that is at the level of the surrounding ground or street.
Die Wohnung im Erdgeschoss hat einen direkten Zugang zum Garten.
The apartment on the ground floor has direct access to the garden.

The word is a clear compound of 'Erde' (earth/ground) and 'Geschoss' (floor, story). It literally refers to the floor that lies at ground level.
Der Supermarkt befindet sich im Erdgeschoss des Gebäudes.
The supermarket is located on the ground floor of the building.
Careful: the German 'Erdgeschoss' (ground floor) is what is often called the 'first floor' in American English and the 'ground floor' in British English. The German 'erste Stock' (first floor) is the floor above it.
Ich wohne im Erdgeschoss, also muss ich keine Treppen steigen.
I live on the ground floor, so I don't have to climb any stairs.
To describe a location, you use 'im Erdgeschoss' (on the ground floor, dative). To express movement to there, you use 'ins Erdgeschoss' (to the ground floor, accusative).
Die Toiletten sind im Erdgeschoss.
The restrooms are on the ground floor.
upper floor
'das Erdgeschoss' and 'das Obergeschoss' both refer to floors in a building. 'Das Erdgeschoss' is at street level or entrance level. 'Das Obergeschoss' is above it, for example on the first floor or higher. Learners may confuse the words because both have to do with floors. The important point is the orientation toward the ground: 'Erdgeschoss' is downstairs at street level, while 'Obergeschoss' is above it.

Die Praxis ist im Erdgeschoss, deshalb braucht man keinen Aufzug.
The doctor's office is on the ground floor, so you don't need an elevator.
Am Ende der Treppe kommt man direkt ins Obergeschoss.
At the end of the stairs, you come directly to the upper floor.