Owned System
Owned System (development) in the Stellaris encyclopedia: Owned Systems are star Systems that fall under an empire's control, either through direct expansion or conquest. Ownership allows an empire to construct Starbases, extract resources, and establish Colonies within the system.
Owned System in the game's words
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Owned Systems are star 
Systems that fall under an empire's control, either through direct expansion or conquest. Ownership allows an empire to construct Starbases, extract resources, and establish 
Colonies within the system.
Maintaining control over systems contributes to an empire's 
Empire Size, with the number of owned systems influencing administrative efficiency and bureaucratic costs.
Entries that mention Owned System
More in Development
Source: common/game_concepts (concept_owned_system, also concept_owned_systems) and localisation/english, Stellaris Cygnus v4.5.2 (9776).