Floor
The term floor is used in 3 basic ways:
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A person who has the floor or a person who is currently a recognized speaker during a formal meeting such as a session of the House or Senate, committee, or other such meetings.
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A person who is on the floor is a person who is physically present during a formal meeting such as a session of the House or Senate, committee, or other such meetings.
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The floor is the actual floor or room that a formal session of the House or Senate, committee, or other such meetings are taking place on/in.
U.S. Senate Definition:
Action "on the floor" is that which occurs as part of a formal session of the full Senate. An action "from the floor" is one taken by a Senator during a session of the Senate. A senator who has been recognized to speak by the chair is said to "have the floor."
Reference:
http://www.senate.gov/reference/glossary.htm