0 the level of a building that is one level above the street:
1 on the level of a building that is one level above the street:
We had a first-floor flat. I had to drag the baby's pram up eighteen steep stairs to get to it.
He had been crouched on the first-floor landing for a long time.
The storm caused flooding in 20 first-floor apartments.
Police believe he entered the building from a first-floor window at the back of the house.
2 the ground floor
A minute later she reappeared on a first-floor balcony.
There are two first-floor bedrooms and a ground-floor sitting room and kitchen.
