A more thorough explanation:

Definition: Feoffamentum is a Latin term used in law that refers to the act of conveying a freehold estate, which is a grant of land in fee simple. It is also known as feoffment with livery of seisin. Feoffment can also refer to the land that is granted or the charter that transfers the land.

Example: In medieval England, conveyances of freehold land could only be made by a feoffment with livery of seisin. This was a solemn ceremony where the parties entered the land, and the feoffor delivered the seisin to the feoffee by handing them a twig or sod of earth or uttering some words like "Enter into this land and God give you joy" and leaving them in possession of the land.

Feoffment to uses: Feoffment to uses refers to the enfeoffment of land to one person for the use of a third party. The feoffee was bound in conscience to hold the land according to the prescribed use and could derive no benefit from the holding.

Example: A landowner may enfeoff their property to a trustee for the use of a charity. The trustee would hold the land and manage it for the benefit of the charity, but they would not be able to use the land for their own benefit.

Overall, feoffamentum is a legal term that refers to the transfer of land ownership through a formal ceremony or charter. It was an important part of medieval land law and is still used in some legal contexts today.