Around these parts, when you see the word "materialism", it's being used in the philosophical sense, rather than the common usage.

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.

Taken from the Routledge Encyclopedia of Philosophy: https://www.rep.routledge.com/articles/thematic/materialism/v-1