The affix, "ceas" does not have a fixed meaning, however the most probable meaning is "to stop". The affix, "ceas" can be used in the following ways.
1. As a prefix- "ceased", "ceasing"- Both of these mean to stop.
2. As a suffix- "deceased", "predeceases"- Both these words refer to death, or to stop living.
Thus, it can be said that the most probable meaning of the affix "ceas" is stop.