also: じせい
noun
Refers to the period or act of governing, especially by a monarch or sovereign.
エリザベス女王の治世は70年以上続いた。
Queen Elizabeth's reign lasted over 70 years.
この法律は明治天皇の治世に制定された。
This law was enacted during the reign of Emperor Meiji.
noun
peaceful times; era of good governance
Implies a period of peace and prosperity under a wise ruler; often used in historical or literary contexts.
人々は治世の恩恵を享受した。
The people enjoyed the benefits of the peaceful era.
統治 refers to the act of governing or administration, often in a political or colonial context, while 治世 emphasizes the period or quality of a ruler's reign.
治政 is a near-synonym also meaning 'reign' or 'administration', but 治世 is more common and carries a slightly stronger nuance of peace and order.
Compound of 治 (govern, rule) and 世 (world, era). The reading ちせい is the standard on'yomi; じせい is a less common variant.