The Collaborative International Dictionary of English v.0.48:

Assythment \As*syth"ment\, n. [From OF. aset, asez, orig.
   meaning enough. See Assets.]
   Indemnification for injury; satisfaction. [Chiefly in Scots
   law]
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

ASSYTHMENT, Scotch law. An indemnification which a criminal is bound to make
to the party injured or his executors, though the crime itself should be
extinguished by pardon. Ersk. Pr. L. Scot. 4, 3, 13.