In the UK we call it the ground floor.
A cellar (or basement) is below the ground level of a house or building.
A cellar is always underground, so you can just call it a cellar. A cellar is where you'd store stuff like food or random items.
Basement/cellar.
Cellar Basement
a basement, my grandmother would call our basement a cellar and when i asked what it was she said it was another word (synonym) for basement.
What in America is called the 'first floor' is called the 'ground floor' in Britain. The floor immediately above that is the 'first floor', what Americans would call the 'second floor'.
Brothers on Call - 2011 Music Cellar - 1.8 was released on: USA: 27 November 2011
Cellar Basement
One who sells is a seller; the below-ground floor of the house is a cellar.
The chambers of the lord called a solar, on the top floor. Store and well in the cellar and guardrooms and maybe a great hall on the first floor.
Cellar/seller
Brothers on Call - 2011 Tuscan Wine Cellar 2-6 was released on: USA: 24 June 2012