cas|sa|tion1 «ka SAY shuhn», noun.
the act of making null or void; annulment or reversal.
╂[< Medieval Latin cassatio, -onis < Late Latin cassāre annul, and < Latin quassāre break]
cas|sa|tion2 «ka SAY shuhn», noun.
a small serenade of the 1700's, often performed outdoors: »
These pieces are patently street music; like cassations of old, both for and of the open air (Saturday Review).
╂[< Italian cassazione; origin uncertain]
Useful english dictionary. 2012.