Compartment (noun)

1. A separate section or room in a larger structure.
2. A separate area or compartment in a container or vehicle.

Origin:

From the french word "compartiment" meaning "partition" or "part of a whole".

Examples:

1. The train had compartments for first class and second class passengers.
2. The refrigerator has a compartment for storing frozen food.
3. The organizer has different compartments for different types of stationery.
4. His luggage was stored in the overhead compartment on the plane.
5. The brain is divided into different compartments for different functions.