fiefdom

/ˈfiːfdəm/
noun
  1. An area, organization, or activity that someone controls completely and does not allow others to interfere with.
    • In many large companies, department heads create their own fiefdoms and refuse to cooperate.
    • The coach turned the soccer program into his fiefdom, making all decisions without input.
    • The senior editor ran the newspaper's opinion section as her personal fiefdom.
  2. A territory or area controlled by a lord in the feudal system.
    • Castles were built throughout the fiefdom to protect the land from invaders.
    • The baron ruled his fiefdom with absolute authority over the local peasants.
    • Each fiefdom had its own laws and customs under the lord's rule.
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