noun Philosophy.
a theory that the mind and the body may each affect the other.

1900–05; interaction + -ism

interactionist, noun, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
interactionism (ˌɪntərˈækʃəˌnɪzəm)
philosophy Compare parallelism the dualistic doctrine that holds that mind and body have a causal effect upon one another, as when pricking one's finger (physical) causes pain (mental), or an embarrassing memory (mental) causes one to blush (physical)

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
One of his favorite metaphors for interactionism concerns a car making a screeching noise.
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