Materialism is the philosophical belief that the world is comprised of small units of “material” These small substances are what comprise the body. The theory postulates that the body is like a machine made up of various parts. If we understand the parts well enough, we can “fix” the broken ones and restore the body to health. This is in contrast to the vitalistic belief of homeopathy which postulates an immaterial vital force or dynamic energy as the basis of all life.
the philosophical theory that regards matter and its motions ... [as the only constituents of] the universe, and all phenomena, including those of mind [or the existence of life], as due to material agencies
the use of innovative and unique features in theories, forms, style, themes, and topics; involves an intentional and revolutionary break with conservative recognized styles of literature. London's crisp, short sentences were a break from the "purple prose" of the Gilded Age, as was his choice of naturalist topics.
The philosophical perspective that nothing exists except the material, physical world. As Carl Sagan famously put it: "The Cosmos is all there is, or ever was, or ever will be." This view is also know as "Naturalism." Materialism tends to be one of the foundational tenets of atheism.
A general philosophical view that only physical processes exist. The term is also applied to philosophical theories of mind which claim that mental states are identical with brain states. See also Dualism, Eliminativism, Functionalism.
In philosophy, materialism is that form of physicalism which holds that the only thing that can truly be said to exist is matter; that fundamentally, all things are composed of material and all phenomena are the result of material interactions; that matter is the only substance. As a theory, materialism belongs to the class of monist ontology. As such, it is different from ontological theories based on dualism or pluralism.