Sponsor a member of congress who is willing to introduce and back the legislation 2.chamber one of the two chambers in government, either the senate or the house of representatives 3.floor action the time when congress is active and members are present, fulfilling their respective duties 4.house of congress a legislative meeting hall 5.in session activity concerning a bill, which may include debates and compromises

A sponsor is a member of congress who is willing to introduce and back the legislation.

A chamber is a legislative meeting hall. 

One of the two chambers in government, either the senate or the house of representatives: house of congress

Activity concerning a bill which may include debates and compromises: floor action.
 
The time when congress is active and members are present, fulfilling their respective duties: in session