adicity /æˈdɪsɪti/ noun2 •The number of arguments or operands a function or operation takes. For a relation, the number of domains in the corresponding Cartesian product.We have seen that every relation, without exception, necessarily has a term set, and the necessary properties of simplicity and an adicity: relations without these are impossible, merely nominal. — 2007 •(no longer used) Valence. formsadicities