 There are different ways of explicating the intuitive notion of grounding used in the definition of Moderate PIT. For our purposes here, we can say that A grounds B when B obtains in virtue of A. This gloss is itself in need of further analysis, but for now it is enough to know that grounding is an asymmetric relation of metaphysical determination (see Trogdon 2013 for an introduction to grounding). An example of grounding that is similar to the grounding relation posited by some proponents of Moderate PIT is the (alleged) grounding of linguistic meaning in speaker intentions: on many views of language, words have their meanings in virtue of speakers’ intentions toward them. To say that A is partly grounded in B is to that say that A is grounded in the combination of B and other factors.