The interior bottom or surface of a house or building; the supporting surface of a room.

(geology, biology, chiefly with a modifier) The bottom surface of a natural structure, entity, or space (e.g. cave, forest, ocean, desert, etc.); the ground (surface of the Earth).

(construction, architecture) A structure formed of beams, girders, etc, with proper covering, which divides a building horizontally into storeys/stories.

The supporting surface or platform of a structure such as a bridge.

(architecture) A storey/story of a building.

In a parliament, the part of the house assigned to the members, as opposed to the viewing gallery.

(by extension) The right to speak at a given time during a debate or other public event.

(nautical) That part of the bottom of a vessel on each side of the keelson which is most nearly horizontal.

(mining) A horizontal, flat ore body; the rock underlying a stratified or nearly horizontal deposit.

(mining) The bottom of a pit, pothole or mine.

(mathematics) The largest integer less than or equal to a given number.

(gymnastics) An event performed on a floor-like carpeted surface; floor exercise

(gymnastics) A floor-like carpeted surface for performing gymnastic movements.

(finance) A lower limit on the interest rate payable on an otherwise variable-rate loan, used by lenders to defend against falls in interest rates. Opposite of a cap.

A dance floor.

The trading floor of a stock exchange, pit; the area in which business is conducted at a convention or exhibition.

The area of a casino where gambling occurs.

The area of an establishment where food and drink are served to customers.

(transitive) To cover or furnish with a floor.

To strike down or lay level with the floor; to knock down.

(driving, transitive, slang) To push (a pedal) down to the floor, especially to accelerate.

(informal, transitive) To silence by a conclusive answer or retort.

(informal, transitive) To amaze or greatly surprise.

(colloquial, transitive) To finish or make an end of.

(mathematics) To set a lower bound.