The Commens Dictionary
Quote from ‘Nomenclature and Divisions of Dyadic Relations’
The broadest division of dyadic relations is into those which can only subsist between two subjects of different categories of being (as between an existing individual and a quality) and those which can subsist between two subjects of the same category. A relation of the former kind may advantageously be termed a reference; a relation of the latter kind, a dyadic relation proper.
‘Reference’ (pub. 14.08.17-08:46). Quote in M. Bergman & S. Paavola (Eds.), The Commens Dictionary: Peirce's Terms in His Own Words. New Edition. Retrieved from http://www.commens.org/dictionary/entry/quote-nomenclature-and-divisions-dyadic-relations-2.