[ka-sey-shuh
n, kuh-] 
| 1. | annulment; cancellation; reversal. |
| 2. | Music. an 18th-century instrumental suite for outdoor performance, similar to the divertimento and the serenade. |
| cas·sa·tion (kā-sā'shən) n. Abrogation or annulment by a higher authority. [Middle English cassatioun, from Old French cassation, from Late Latin cassātiō, cassātiōn-, from cassātus, past participle of cassāre, to annul; see quash1.] |
cassation
in music, 18th-century genre for orchestra or small ensemble that was written in several short movements. It was akin to the 18th-century serenade and divertimento and, like these, was often intended for performance outdoors.
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