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'''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.

'Materialism' is an ontological position which holds that is no immaterial or spiritual realm. Only things which are detectable in some form by the senses and sense experience- for instance [[forks]], [[matter]], [[radiation]], [[heat]], [[neutrinos]], [[galaxies]], and so forth. It assumed by the position of [[empiricism]], and therefore [[science]], and is contrasted with [[substance dualism]] and [[immaterialism]]. Arguments for materialism commonly employ [[ontological principles]] such as [[Occam's Razor]]- as an immaterial realm is wholly superfluous to our understanding of the world, we have no reason to believe it exists.