1. supreme power or authority; sovereignty or dominion over a territory or people
Usage: formal or literary; often used in historical or political contexts
2. a territory or domain under the control of a sovereign power
Usage: archaic or literary

Examples

• The Roman empery extended across three continents at its height.
• She wielded her empery with wisdom and justice.
• The king's empery was challenged by rival factions.
• Colonial emperies competed for control of distant lands.
• His empery over the province lasted only a decade.