The Space of Nominal Reference Almerindo Ojeda University of California at Davis Tradition has it that a noun is the name of a person, a place, or a thing. But what persons, places, or things, can a noun name? What, indeed, is the space of nominal reference? For every set of entities one may talk about individually there is a distinct set of entities one may talk about collectively. It is the very set of entities in question, *but taken as a whole*. Thus, if we can talk individually about five birds in a tree, then we can also talk collectively about the five birds in the tree. Similarly, if we can talk about the coffee each of us is now drinking, then we can talk about the coffee all of us are now drinking. Let us say that a *universe of discourse* is the set of entities one may talk about, be it individually or collectively, on a particular occasion of linguistic use. Let us furthermore say that the *partitive relation* on a universe of discourse is the relation which holds between two elements of the universe whenever one of the elements is a collective whole having the other element as part. The partitive relation thus holds between each of the five birds in a tree and the five birds taken as a whole. It likewise holds between the coffee each of us is now drinking and the coffee all of us are now drinking. Partitive relations on universes of discourse have become commonplace in the semantics of nonsingular reference--see for example the work of Massey, Wald, Link, Krifka, Landman, Barker, Eschenbach, and Ojeda. In this talk, partitive relations will be used to define thirty or so families of subsets of a universe of discourse in terms of notions like individuation, discreteness, magnitude, variety, and reciprocity. The claim is then made that every noun must pick its reference from within the families in question--or that the space of nominal reference is contained in the union of these families. It is then noted that this claim may lead to a drastic reduction of the powerset of a universe of discourse, which is the *a priori* space of nominal reference. The membership of these families will be illustrated with data from a wide variety of languages.