- the floor above the ground floor of a building
- in Europe and Great Britain, the floor two stories above the ground floor: sometimes used in this sense in hotels, etc. in the U.S.
The living quarters are located on the second floor of the beach house to take advantage of the beautiful ocean views.
Second floor is the level of a building, up one flight of stairs from the ground floor.
An example of a second floor is the upstairs location where bedrooms are in many two-story suburban homes.