cham·ber n
1: a judge's office; specif: the private office where a judge carries on business other than court sessions (as conferences or signing papers)
— usu. used in pl.
four other judges met in my chambers — R. H. Bork
a hearing in chambers
2 a: a hall for the meetings of a deliberative, legislative, or judicial body or assembly
to run back into the House chamber — Tip O'Neill
b: a legislative or judicial body: house
approved by two-thirds of each chamber of Congress — U.S. Code
Merriam-Webster’s Dictionary of Law. Merriam-Webster. 1996.