chamber (n.) Look up chamber at Dictionary.com
c.1200, "room," usually a private one, from Old French chambre "room, chamber, apartment," also used in combinations to form words for "latrine, privy" (11c.), from Late Latin camera "a chamber, room" (see camera). In anatomy from late 14c.; of machinery from 1769. Gunnery sense is from 1620s. Meaning "legislative body" is from c.1400. Chamber music (1789) was that meant to be performed in private rooms instead of public halls.
chamber (v.) Look up chamber at Dictionary.com
late 14c., "to restrain," also "to furnish with a chamber" (inplied in chambered, from chamber (n.). Related: Chambering.