What is Assedation?

Legal Definition
In Scotch law. An old term, used indiscriminately to signify a lease or feu-right. Bell; Ersk. Inst. 2, 6, 20.
-- Black's Law Dictionary
Legal Definition
In Scotch Law. An old term used indiscriminately to signify a lease or feu-right.—Bell’s Diet.
-- Ballentine's Law Dictionary