Hegemony
Concept · Stellaris 4.5.2
Hegemony in the Stellaris encyclopedia: Federations of this type are most often built around one powerful empire surrounded by lesser satellite states.
Hegemony in the game's words
The encyclopedia entry as the game shows it in its tooltips; underlined words open their own entry or page here.
Federations of this type are most often built around one powerful empire surrounded by lesser satellite states.
Source: common/game_concepts (concept_hegemony_federation) and localisation/english, Stellaris Cygnus v4.5.2 (9776).