/ ˈtʃeɪmbə(r); NAmE / noun
1.
[ C ] a hall in a public building that is used for formal meetings :
The members left the council chamber.
the Senate / House chamber
—see also Chamber of Commerce
2.
[ C +sing./pl. v . ] one of the parts of a parliament :
the Lower / Upper Chamber (= in Britain, the House of Commons / House of Lords)
the Chamber of Deputies in the Italian parliament
Under Senate rules, the chamber must vote on the bill by this Friday.
3.
[ C ] (in compounds) a room used for the particular purpose that is mentioned :
a burial chamber
Divers transfer from the water to a decompression chamber.
—see also gas chamber
4.
[ C ] an space in the body, in a plant or in a machine, which is separated from the rest :
the chambers of the heart
the rocket's combustion chamber
the chamber of a gun (= the part that holds the bullets)
5.
[ C ] a space under the ground which is almost completely closed on all sides :
They found themselves in a vast underground chamber.
6.
[ C ] ( old use ) a bedroom or private room
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WORD ORIGIN
Middle English (in the sense private room ): from Old French chambre , from Latin camera vault, arched chamber, from Greek kamara object with an arched cover.