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Definition exclusivity class/Millikan/(s): ("contrary range", see above I 197) Class of properties that can have a substance or individual, as opposed to others. E.g. melting point, e.g. atomic weight etc. One thing cannot have several melting points or several atomic weights.
Not every thing can have properties from any exclusivity class.
E.g. humans have no atomic weight.
Properties: their identity derives from the constellation of exclusivity classes. E.g. living beings: date of birth, age, weight, etc. but not electrical conductivity etc.
Individual/Object/Property/(s): thus, an object is defined by several dimensions: it cannot have a property from all exclusivity classes, but if it has a property from an exclusivity class, then it cannot have a second property from this exclusivity class.
Correspondingly: if a property of an exclusivity class is present, it is known that 1. all other properties from the same exclusivity class are out of question, 2. that some exclusivity classes are out of question because they cannot belong to the kind of object to which a property from the exclusivity class already established belongs to. E.g. Date of birth and melting point.
R. G. Millikan
Language, Thought, and Other Biological Categories: New Foundations for Realism Cambridge 1987