 Here we would do well to systematically distinguish between those proponents of  (RI)  who hold that only one metaphysical dependence relation, e.g., mereological dependence or a strongly unified notion of grounding, is relevant to fundamentality and those who think that a proper subset of these relations is relevant to fundamentality. Sometimes the labels monism and pluralism are used to distinguish between the singular fundamentality view and the multi-dimensional view, but in the interest of clarity we should introduce different terms, as we have already used these labels for another  purpose.[12]  So, let us use the labels (RI-one) and (RI-many) to distinguish between those who think that there is only one notion of fundamentality and those who think that there are several. Typically, there is an easy translation between these views. Let us say that a proponent of (RI-one) thinks that only mereological dependence is relevant to fundamentality. Well, a proponent of (RI-many), provided that mereological dependence is one of the relations they consider relevant to fundamentality, can simply translate the (RI-one) notion of fundamentality into their (RI-many) notion of mereological fundamentality. Hence the disagreement is that from the (RI-one) point of view, there is a single notion of fundamentality, and they would think that (RI-many) mistakenly holds other notions of fundamentality to be genuine, whereas from the (RI-many) point of view, there are many relativized notions of fundamentality, and (RI-one) mistakenly picks just one, or indeed none depending on whether the relevant (RI-one) relation is  included.[13]