compartmentation

noun4

1. •
   Division into compartments; compartmentalization.
2. •
   So as to prevent the spread of fire within a structure.

   • The fire spread rapidly after the building's compartmentation failed.
3. •
   So as to prevent the spread of water (or rarely, another fluid) between otherwise watertight compartments (especially on a ship).

   • The Titanics compartmentation' did not stop water from entering rooms.
4. •
   The dissemination of information and knowledge between different people or organisations on a need-to-know basis, so as to reduce the risk of espionage should one person or organisation be compromised externally; compartmentalization.

   • Nevertheless the principles of compartmentation of information and need to know are essential to secrecy. — 1956