Game concept · All Under Heaven
Movement
The game also links it as Movements, Movement's, Movements'.
From the game's encyclopedia
Group of Characters with shared interests and vision of the Dynastic Cycle. Each Movement member can have access to different Interactions and Decisions to nudge the cycle. A Movement Leader is a spokesperson that represents the Movement's interests with Son of Heaven.
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.
Movement is an entry of Crusader Kings III's in-game encyclopedia (All Under Heaven). The game explains it: "Group of Characters with shared interests and vision of the Dynastic Cycle." It is part of Participant Group. It covers Movement Power, Movement Leader, Favored Movement, Disciple and Elder. The game also links it as Movements, Movement's and Movements'. Patch 1.20.1.2, from game/common/game_concepts/tgp_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.
Source: game/common/game_concepts/tgp_game_concepts.txt, game/localization/english/game_concepts_l_english.yml and the English localisation, Crusader Kings III 1.20.1.2.