Such that the order in which the operands are taken does not affect their image under the operation.
Such that any two sequences of morphisms with the same initial and final positions compose to the same morphism.
Having a commutative operation.
Relating to exchange; interchangeable.
Persisting for an extended period of time.
A durable woollen material formerly used for women's shoes.
The act or process of shaping footwear on a last.