floor

1. The interior bottom or surface of a house or building; the supporting surface of a room. (countable) · The room has a wooden floor.
2. The bottom surface of a natural structure, entity, or space (e.g. cave, forest, ocean, desert, etc.); the ground (surface of the Earth). · The leaves covering the forest floor provide many hiding-places for small animals.· Many sunken ships rest on the ocean floor.
3. A structure formed of beams, girders, etc, with proper covering, which divides a building horizontally into storeys/stories.
4. The supporting surface or platform of a structure such as a bridge. · Wooden planks of the old bridge's floor were nearly rotten.
5. A storey/story of a building. (countable) · For years we lived on the third floor.
6. In a parliament, the part of the house assigned to the members, as opposed to the viewing gallery.
7. The right to speak at a given time during a debate or other public event. · Will the senator from Arizona yield the floor?· The mayor often gives a lobbyist the floor.
8. That part of the bottom of a vessel on each side of the keelson which is most nearly horizontal.

Plural floors