compartment

Short definition from Wiktionary

Noun

1. 1
   A room, or section, or chamber, typically within a vehicle.
2. 2
   One of the parts into which an area is subdivided.
3. 3
   The part of a protein that serves a specific function.
4. 4
   A mound (often of grass), shelf (of e.g. wall) or other thing beneath the shield in a coat of arms on which the supporters stand.
5. 5
   A region in the body, delimited by a biological membrane.

Verb

1. 1
   To arrange in separate compartments.