Unary means "consisting of one element"; is there a word meaning "consisting of more than one element"?
Poly-ary sounds wrong, as does mult-ary...
What is the opposite (in this sense) of unary?
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The word plurarity does not appear in the dictionary, but if you google it there are quite a few cases of it being used this way.
While plur- is a valid Latin prefix, English words using it usually start with plural-, pluralism for instance.
So I suppose it could be seen as a portmanteau of plural and arity.
In that same sense, a word for n-arity > 1, could be plurary.
You can use multiple-arity if different numbers of arguments are accepted (e.g. a polymorphic function/method), or n-ary if you want to be indefinite about the arity. But I don't know of a term for arity > 1.