A storey or story is any level part of a building that could be used by people (for living, work, storage, recreation, etc.). The plurals are storeys and stories, respectively. The terms floor, level, or deck can also be used in this sense; except that one may use “ground floor” and “ground level” for the floor closer to what is considered the ground or street level, whereas “storey” is commonly used only for levels strictly above or below that level.