[count] 1 : a small space inside something (such as a machine or your body) ▪ He put three bullets into the chamber of the gun. ▪ the chambers of the heart
2 : a usually large room where members of a government group (such as a legislature) have meetings ▪ We waited for the senator outside the Senate chamber.
3 : a group of people who form part of a government ▪ The U.S. legislature is separated into two chambers: the Senate and the House of Representatives. ▪ the upper and lower chambers of the British Parliament [=the House of Lords and the House of Commons] —see also chamber of commerce
4 : a room where a judge goes to do official business or to discuss cases with lawyers outside of the courtroom —usually plural ▪ the judge's chambers
5 formal + old-fashioned : a person's bedroom or other private room ▪ the queen's personal chambers ▪ a bridal chamber [=a bedroom used by two people who have just been married] ▪ the temple's inner chambers
6 : a room used for a special purpose ▪ the burial chambers inside an Egyptian pyramid ▪ a torture chamber —see also gas chamber