Definitions

1. noun

A kingdom or realm, especially a medieval European state ruled by a monarch.

“The regnum of the medieval kingdom was divided into several provinces.”

2. noun

A territory or domain under the control of a monarch, especially a Catholic bishop.

“The regnum of the bishop covered a large area of land with several villages.”

3. noun

A field or sphere of activity or study, especially in a specific area of art or science.

“The regnum of Renaissance art was dominated by the works of Leonardo da Vinci.”