Game concept · All Under Heaven
Dynastic Cycle Era
The game also links it as Dynastic Cycle Eras, Era, Eras.
From the game's encyclopedia
The socio-political state of the Dynastic Cycle.
Eras:
• Stable Era: Advancement, Expansion
• Unstable Era: Tension
• Chaotic Era: Division
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.
Dynastic Cycle Era is an entry of Crusader Kings III's in-game encyclopedia (All Under Heaven). The game explains it: "The socio-political state of the Dynastic Cycle." It is part of Dynastic Cycle. The game also links it as Dynastic Cycle Eras, Era and Eras. 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.