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According to the Routledge Encyclopedia of Philosophy, "'''Materialism''' is a set of related theories which hold that all entities and processes are composed of – or are reducible to – matter, material forces or physical processes. All events and facts are explainable, actually or in principle, in terms of body, material objects or dynamic material changes or movements. In general, the metaphysical theory of materialism entails the denial of the reality of spiritual beings, consciousness and mental or psychic states or processes, as ontologically distinct from, or independent of, material changes or processes." [http://www.rep.routledge.com/article/DC098?ssid=92049736&n=1#]

'''Materialism''' is a blanket term covering several theories, the main thrust of which is that detectable [[matter]] is the only substance that exists in the universe; that is no immaterial or spiritual realm.