Marxism is many things. Whether or not one agrees with the likes of Michael Heinrich that it is not a worldview (I believe it most certainly is), it denotes a varying set of processes of collective and individual human practice and cognition. Whether or not you want to call that a worldview, well, you do you, boo.  To define it is thus, in a sense, to engage in it. Marxism of course is not limited to being operationalized, as it were as a “discourse” or a set of written procedures. As is apocryphally told, the great American revolutionary socialist Big Bill Haywood once remarked that he neve read Marx’s Capital but his body was covered with “marks from capital”.  Yet accepting the absolute primacy of sensual creative human practice, what Marx calls “form giving fire” of human labour, there is still the word and the set of words, the discourse, better yet, the rhetoric, or even better yet the poetic.