noun
closed system
A system that does not interact with its environment; used in engineering, computing, and physics contexts.
この工場ではクローズドシステムを採用して排水を再利用している。
This factory uses a closed system to recycle wastewater.
Variant with a middle dot; less common but still seen.
An open system exchanges matter or information with its surroundings, while a closed system does not.
Loanword from English 'closed system'.