From WordNet (r) 3.0 (2006) [wn]:
compartment
n 1: a space into which an area is subdivided
2: a partitioned section, chamber, or separate room within a
larger enclosed area
From The Collaborative International Dictionary of English v.0.48 [gcide]:
Compartment \Com*part"ment\, n. [F. compartiment, OF. compartir
to divide. See Compart.]
1. One of the parts into which an inclosed portion of space
is divided, as by partitions, or lines; as, the
compartments of a cabinet, a house, or a garden.
[1913 Webster]
In the midst was placed a large compartment composed
of grotesque work. --Carew.
[1913 Webster]
2. (Shipbuilding) One of the sections into which the hold of
a ship is divided by water-tight bulkheads.
[1913 Webster] compartmental