Definitions of floor:

• noun:   the inside lower horizontal surface (as of a room or hallway)

  Example: "They needed rugs to cover the bare floors"

• noun:   structure consisting of a room or set of rooms comprising a single level of a multilevel building
• noun:   a large room in a stock exchange where the trading is done

  Example: "He is a floor trader"

• noun:   the legislative hall where members debate and vote and conduct other business

  Example: "There was a motion from the floor"

• noun:   the parliamentary right to address an assembly

  Example: "The chairman granted him the floor"

• noun:   a lower limit

  Example: "The government established a wage floor"

• noun:   the occupants of a floor

  Example: "The whole floor complained about the lack of heat"

• noun:   the bottom surface of any a cave or lake etc.
• noun:   the ground on which people and animals move about

  Example: "The fire spared the forest floor"

• verb:   surprise greatly; knock someone's socks off

  Example: "I was floored when I heard that I was promoted"

• verb:   knock down with force
• name:  A surname (very rare: popularity rank in the U.S.: #35838)