compartment (n.)

a part separated from adjoining parts by a partition," "1560s, from Middle French compartiment "part partitioned off" (16c.), through Italian compartimento, from Late Latin compartiri "to divide," from com-, here probably as an intensive prefix (see com-), + partis, genitive of pars "a part, piece, a share, a division" (from PIE root *pere- (2) "to grant, allot").