Final answer:
Seisin is the legal concept that denotes ownership and control of a property, granting the holder all associated rights, including the ability to contract with others using the property.
Step-by-step explanation:
The term seisin refers to the ownership of property, which implies possessing both the title and the control of the property. Seisin provides the holder with the legal ability to use their property as they see fit, including but not limited to the right to enter into contracts with other parties using the property. This concept is crucial in property law as it establishes one's claim and right to the land or real property.