What is the meaning of the word "earldom"?

In contemporary usage, an earldom is primarily a hereditary title within the British peerage system, and the title of earl is often passed down through noble families. The holder of an earldom may have certain ceremonial, social, and sometimes political privileges associated with their title.

Definitions:

Historically, associated with a specific territory or region, over which the earl held jurisdiction or governance. NOUN
- The Earl of Devonshire inherited the family's ancestral estate along with his earldom.
Refers to the area of land or title held by an earl. NOUN
- The earldom of Warwick has a rich history dating back to medieval times.