Game concept
Government
The game also links it as Governments, Government Form, Government Forms.
From the game's encyclopedia
A Ruler's Government Form determines what kind of Laws they have access to, as well as what Obligations they have to their Liege if they are not Independent.
The Government forms are: Feudal, Tribal, Clan, Theocracy, Republic, Administrative, Nomadic and Herder.
The game's text for patch 1.20.1.2. Words in blue are entries of the encyclopedia: hover one to read it, as in the game.
Government is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "A Ruler's Government Form determines what kind of Laws they have access to, as well as what Obligations they have to their Liege if they are not Independent." It covers Feudal, Tribal, Clan, Theocracy, Republic and 7 more. The game also links it as Governments, Government Form and Government Forms. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/00_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.