Dictionary![]() ![]() cas•sa•tionPronunciation: (ka-sā'shun, ku-), [key] —n. 1. annulment; cancellation; reversal. 2. Music.an 18th-century instrumental suite for outdoor performance, similar to the divertimento and the serenade. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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