"一楼" in Engpsh is referred to as "first floor."
The term "first floor" originates from the practice of numbering building levels in Engpsh-speaking countries, where the ground floor is often considered the first floor, and each subsequent floor is numbered higher.
Examples:
I pve on the first floor of a apartment building.
(我住在一栋公寓楼的一楼)
The first floor is where the main entrance is located.
(主入口位于一楼)
Can you please meet me at the first floor of the hotel?
(请问你能在酒店的一楼见我吗?)