compartmentalization

noun

com·​part·​men·​tal·​iza·​tion

variants or British compartmentalisation

kəm-ˌpärt-ˌment-ᵊl-ə-ˈzā-shən 

: isolation or splitting off of part of the personality or mind with lack of communication and consistency between the parts

compartmentalize transitive verb

or British compartmentalise

-ˈment-ᵊl-ˌīz 

compartmentalized or British compartmentalised; compartmentalizing or British compartmentalising