Is there a term like n-ary that describes the number of return values instead of the number of parameters of a function?

Question

I want to accept a function that returns a tuple. Is there a way to describe a function's return tuple length?

Answer 1

The doesn't seem to be. Probably because it isn't necessary in formal logic as 2 functions are used instead of one function with two outputs.
If the arity or adicity is the dimension of the domain of the cartesian product of a function what you are looking for is the dimension of the range. Possibly the term "valency" could be used in a particular document as it has a similar meaning to arity but is not so commonly used in computer science so you could use it if you explained your usage up front.