noun

• (law, historical) Land held of a superior, particularly on condition of homage, fealty, and personal service, especially military service.
  "Fief: m[asculine] A Fief. A (Knights) fee, a Mannor, or inheritance held by homage, and fealty; and given at the firſt, in truſt, and upon promiſe of aſſiſtance, or ſervice in the wars: […] Alſo, a Tenure, or Eſtate in fief, or in fee. This word was firſt heard of, after the conqueſt of Gallia by the Francs (or ancient French-men) when their Soveraign Princes, reſerving ſome land for their own Domains, diſtributed the reſt (by whole Countreys, or large territories) among their Captains, and principal followers, on condition, that they ſhould hold of them, and aid them in their wars […]"
• (figurative) Synonym of estate: any land, when considered as a region over which the owner exercises lordly control.
  "Through the years of my childhood my maternal grandmother remained the one unforgettable presence, the strong country woman ruling over her farm like a medieval lord. On her fief I first opened my eyes to poetry and to the land. […] There was something of the ancient matriarch in her, who had given her life to the ground, who felt that on her fief in southern Luxembourg she stood in the right place."
• (figurative) A territory, a domain, an area over which one exercises lordly control, particularly with regard to corporate or governmental bureaucracies.