first floor

Từ điển Oxford Advanced Learner 8th

ˌfirst ˈfloor [first floor first-floor] BrE NAmE (usually the first floor) noun singular
1. (BrE)the level of a building above the ground level
•Menswear is on the first floor.
2. (NAmE) (BrE ˌground ˈfloor)the floor of a building that is at the same level as the ground outside
Derived Word: ↑first-floor
See also: ↑ground floor

British/American:
floor
In BrE the floor of a building at street level is the ground floor, the one above it is the first floor and the one below it is the basement, or lower ground floor in a public building.
In NAmE the floor at street level is usually called the first floor, the one above it is the second floor and the one below it is the basement. In public buildings the floor at street level can also be called the ground floor.
note at ↑storey

• Từ đồng nghĩa / Synonyms:
  ground floor, ground level