Game concept

Complete Control

The game also links it as Completely Controls, Completely Control.

From the game's encyclopedia

This condition is fulfilled when all Counties in the targeted Region are held by either the ruler or by their Vassals and none of its Counties are occupied by hostile armies.

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.

Complete Control is an entry of Crusader Kings III's in-game encyclopedia. The game explains it: "This condition is fulfilled when all Counties in the targeted Region are held by either the ruler or by their Vassals and none of its Counties are occupied by hostile armies." The game also links it as Completely Controls and Completely Control. Patch 1.20.1.2, from game/common/game_concepts/00_game_concepts.txt and game/localization/english/game_concepts_l_english.yml.

for a guide, post or blog

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.