A more thorough explanation:

Term: ad feodi firmam
Definition: Ad feodi firmam is a legal term that means "to fee farm." It refers to a type of lease agreement where the tenant pays a fixed annual rent to the landlord in exchange for the right to use and profit from the land. The tenant is responsible for managing the land and can keep any profits made from it, but must also pay any taxes or fees associated with it.
Examples: An example of ad feodi firmam would be a farmer leasing a piece of land from a landowner. The farmer would pay a fixed annual rent to the landowner and would be responsible for managing the land, planting crops, and harvesting them. The farmer would keep any profits made from selling the crops, but would also have to pay any taxes or fees associated with the land. Another example would be a business leasing a building from a landlord. The business would pay a fixed annual rent to the landlord and would be responsible for managing the building and using it for their business operations. The business would keep any profits made from their operations, but would also have to pay any taxes or fees associated with the building. These examples illustrate how ad feodi firmam works as a lease agreement where the tenant pays a fixed annual rent to the landlord in exchange for the right to use and profit from the land or building.