(1) "The theory that all apparently mental occurrences either are really physical, or at any rate have purely physical causes."
(Russell, The Practice and Theory of Bolshevism see chapter on Dialectical Materialism)

(2) The theory that all things are composed of material, and that all emergent phenomena (including consciousness) are the result of material properties and interactions.

1. As opposed to:
(a) dualism (the belief that mind and matter are distinct entities), and
(b) idealism (the belief that only mental entities are real).
Categories: terminology ontology

Please comment