BrE = British English | NAmE = North American English
In BrE the floor of a building at street level is the ground floor, the one above 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 is the basement. In public buildings the floor at street level can also be called the ground floor.
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Top Tips Abz Ingles - Notes on usage - British/American
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