1. the domain, territory, or realm ruled by a kaiser (German or Austrian emperor)
Usage: historical; often capitalized when referring to a specific empire
2. the office, rank, or authority of a kaiser
Usage: historical

Examples

• The Austro-Hungarian kaiserdom stretched across much of Central Europe in the 19th century.
• During World War I, the German kaiserdom was one of the major European powers.
• The collapse of the kaiserdom marked the end of an era in European history.
• Historians study the structure and governance of the Prussian kaiserdom.
• The kaiserdom's influence extended far beyond its immediate borders.