Wiktionary
binary function
n. (context mathematics English) a function of the type , or more generally, a function of the type in which exactly two of the sets ''Ui'' are equal to ''V''.
Wikipedia
Binary function
In mathematics, a binary function also called bivariate function, or function of two variables, is a function that takes two inputs.
Precisely stated, a function f is binary if there exists sets X, Y, Z such that
f: X × Y → Z
where X × Y is the Cartesian product of X and Y.
Usage examples of "binary function".
Sections of analytical capacity normally given over to movement and backup and support functions were folded in on themselves, doubling their capacity as the same binary function was invested with double meanings.