What is the X in X-mas?
In philosophy, the position that nothing exists except matter — things that can be measured or known through the senses. Materialists deny the existence of spirit, and they look for physical explanations for all phenomena. Thus, for example, they trace mental states to the brain or nervous system, rather than to the spirit or the soul. Marxism, because it sees human culture as the product of economic forces, is a materialist system of beliefs.