I don't feel very sophisticated in this particular discussion, but I would say that when anything reaches the threshold of "isness" it is material. to me this is just semantics. Physicist speaks of being a Deist. I suppose I am a monist, if that term is not obsolete. Of course, quantum theory allows matter to embody what used to be called dualism. The difference between philosophical dualism and quantum theory is that quantum duality can be observed and studied.
Now I'm going to take a nap before I drown in my own BS.
The definition of materialism cautioned that it is not taken to be semantic (emphasis mine):