fee farm
noun
1- Law, chiefly historical an estate or land held in fee simple subject to a perpetual fixed rent【律】〈主史〉无条件继承的不动产（或土地）
1.1
- mass noun the tenure of land by such means无条件继承的土地的保有权。
1.2
- mass noun the rent paid for such land无条件继承的土地的地租。