| occasional | Appearing or occurring irregularly and according to no fixed or certain scheme. (18 Nov 1997) |
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| occasionalism | <psychology> 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. Source: Websters Dictionary (01 Mar 1998) |