commutative

1. Relating to, involving, or characterized by substitution, interchange, or exchange.
2. Independent of order. Used of a logical or mathematical operation that combines objects or sets of objects two at a time. If a × b = b × a, the operation indicated by × is commutative.

An operation or function is commutative if its value is not affected when its arguments are exchanged. Addition is commutative, since x + y = y + x. Division is not commutative, since x/y ≠ y/x.

The adjective has one meaning:

Meaning #1: (mathematics) of a binary operation; independent of order; as in e.g. "a x b = b x a"