compartmentalization

noun5

1. •
   Division into compartments or parts.
2. •
   The act or process of dividing a complex task or structure into smaller, often more manageable pieces.

   • In reality, the multidimensionality of language contact in multilingual environments ensures no such neat compartmentalisation. — 2018
3. •
   A defense mechanism in which thoughts and feelings that seem to conflict are kept separated or isolated from each other in the mind.
4. •
   The act of dividing complex code into libraries with common functionality to help make the process of programming more manageable and reusable.
5. •
   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.