A more thorough explanation:

SEISOR

A seisor is a person who takes possession of a freehold.

Example 1: John became a seisor when he inherited his grandfather's farm.

Example 2: The new owner of the house became a seisor after the previous owner moved out.

These examples illustrate the definition of a seisor by showing how a person takes possession of a freehold. In the first example, John inherited his grandfather's farm, which means he became the new owner and took possession of the freehold. In the second example, the previous owner moved out, and the new owner took possession of the freehold by becoming a seisor.