Definition of chamber noun from the Oxford Advanced Learner's Dictionary
chamber
noun
ˈtʃeɪmbə(r) ˈtʃeɪmbər
1[countable]a hall in a public building that is used for formal meetingsThe members left the council chamber.the Senate/House chamber see also Chamber of Commerce2[countable + singular or plural verb]one of the parts of a parliamentthe Lower/Upper Chamber(= in Britain, the House of Commons/House of Lords)the Chamber of Deputies in the Italian parliamentUnder Senate rules, the chamber must vote on the bill by this Friday.3[countable] (in compounds) a room used for the particular purpose that is mentioneda burial chamberDivers transfer from the water to a decompression chamber. see also gas chamber4[countable]a space in the body, in a plant or in a machine, which is separated from the restthe chambers of the heartthe rocket's combustion chamberthe chamber of a gun (= the part that holds the bullets)5[countable]a space under the ground which is almost completely closed on all sidesThey found themselves in a vast underground chamber.6[countable] (old use) a bedroom or private roomLady Eleanor was found dead in her chamber.
ˈtʃeɪmbə(r) 
ˈtʃeɪmbər 
1 [countable] a hall in a public building that is used for formal meetingsThe members left the council chamber.the Senate/House chamber see also Chamber of Commerce2 [countable + singular or plural verb] one of the parts of a parliamentthe Lower/Upper Chamber (= in Britain, the House of Commons/House of Lords)the Chamber of Deputies in the Italian parliamentUnder Senate rules, the chamber must vote on the bill by this Friday.