Chamber  n. 1 a hall used by a legislative or judicial body. B body that meets in it, esp. Any of the houses of a parliament. 2 (in pl.) A rooms used by a barrister or barristers, esp. In inns of court. B judge's room for hearing cases not needing to be taken in court. 3 archaic room, esp. A bedroom. 4 mus. (attrib.) Of or for a small group of instruments. 5 cavity or compartment in the body, machinery, etc. (esp. The part of a gun-bore that contains the charge). [greek kamara vault]