Definition: The word "arrentation" refers to a legal system that allows owners to sell their property for a price agreed upon by both parties. It's similar to rent in terms of renting, but it's used more broadly to refer to transactions between individuals or entities where one party uses financial resources (the "owner") to purchase another party's property (the "tenant"). The term is often used to describe the relationship between two people who have agreed on a fair exchange value for a shared possession.