What does "chamber" mean?

Additional senses

1. 2.A hall, as where a king gives audience, or a deliberative body or assembly meets; as, presence chamber; senate chamber.
2. 3.A legislative or judicial body; an assembly; a society or association; as, the Chamber of Deputies; the Chamber of Commerce.
3. 4.A compartment or cell; an inclosed space or cavity; as, the chamber of a canal lock; the chamber of a furnace; the chamber of the eye.
4. 5.pl. (Law.) A room or rooms where a lawyer transacts business; a room or rooms where a judge transacts such official business as may be done out of court.
5. 6.A chamber pot. [Colloq.]
6. 7.(Mil.) (a) That part of the bore of a piece of ordnance which holds the charge, esp. when of different diameter from the rest of the bore; -- formerly, in guns, made smaller than the bore, but now larger, esp. in breech-loading guns. (b) A cavity in a mine, usually of a cubical form, to contain the powder. (c) A short piece of ornance or cannon, which stood on its breech, without any carriage, formerly used chiefly for rejoicings and theatrical cannonades. Air chamber. See Air chamber, in the Vocabulary. -- Chamber of commerce, a board or association to protect the interests of commerce, chosen from among the merchants and traders of a city. -- Chamber council, a secret council. Shak. -- Chamber counsel or counselor, a counselor who gives his opinion in private, or at his chambers, but does not advocate causes in court. -- Chamber fellow, a chamber companion; a roommate; a chum. -- Chamber hangings, tapestry or hangings for a chamber. -- Chamber lye, urine. Shak. -- Chamber music, vocal or instrumental music adapted to performance in a chamber or small apartment or audience room, instead of a theater, concert hall, or chuch. -- Chamber practice (Law.), the practice of counselors at law, who give their opinions in private, but do not appear in court. -- To sit at chambers, to do business in chambers, as a judge.
7. 8.To reside in or occupy a chamber or chambers.
8. 9.To be lascivious. [Obs.]
9. 10.To shut up, as inn a chamber. Shak.
10. 11.To furnish with a chamber; as, to chamber a gun.