IPA: /ˈfiːf.dəm/
KK: /ˈfifdəm/
A territory or area controlled by a powerful person or group, often in a feudal system.
The king granted him a fiefdom in exchange for his loyalty.
Fiefdom is formed from "fief" (from Old French *fief*, meaning a feudal estate) and "-dom" (meaning domain or state of being). The word refers to the domain or territory held under a feudal system, typically granted to a vassal by a lord.
Think of a 'fief' as a feudal estate and '-dom' as a state of being — together, they describe the domain of a feudal estate.