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Definition of Epiphenomenalism
1. Noun. (philosophy psychology uncountable) The doctrine that mental states and processes are simply incidental effects of physiological events in the brain or nervous system and cannot themselves cause any effects in the material world. ¹
2. Noun. (philosophy psychology countable) Such a doctrine, as advanced by a particular thinker or school of thought. ¹
¹ Source: wiktionary.com