 The second definition of fundamentality to be considered is much more versatile and weaker than  (AI).  We call it restricted independence. This produces a relativized sense of fundamentality, where fundamentality is relative to a certain variety or varieties of metaphysical dependence. One should not confuse this with relative fundamentality, which concerns the priority ordering between two (non-fundamental) entities. So, restricted independence starts from the idea that for each metaphysical dependence relation there is a corresponding notion of fundamentality and we must relativize the notion of fundamentality accordingly: