What does "first floor" mean?

The floor of a building at the level of the street or surrounding ground; the ground floor

What is a synonym for "first floor"?

Common synonyms include: clerestory, flat, floor, ground floor, ground level, level.

noun

noun ·Rare ·Advanced level

Noun

1
The floor of a building at the level of the street or surrounding ground; the ground floor Canada, Philippines, US
2
the floor of a building that is at or nearest to the level of the ground around the building wordnet
3
The floor of a building one above the ground floor British