Naturalism is "the idea or belief that nothing exists beyond the natural world". It is the belief that "the natural world is the whole of reality". The term was first used this way in English in 1750.

It is a kind of philosophy called metaphysical, because it covers everything: "nature is all there is, and all basic truths are truths of nature".

All the things and powers which are commonly called supernatural, such as God, souls or witchcraft do not exist, according to this position.