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From The Collaborative International Dictionary of English v.0.48:
Occasionalism \Oc*ca"sion*al*ism\, n. (Metaph.) The system of occasional causes; -- a name given to certain theories of the Cartesian school of philosophers, as to the intervention of the First Cause, by which they account for the apparent reciprocal action of the soul and the body. [1913 Webster]