a. [ L. commutabilis. ] Capable of being commuted or interchanged. [ 1913 Webster ]
The predicate and subject are not commutable. Whately. [ 1913 Webster ]
n. The quality of being commutable; interchangeableness. [ 1913 Webster ]
a. [ L. incommutabilis: cf. F. incommutable. See In- not, and Commutable. ] Not commutable; not capable of being exchanged with, or substituted for, another. Cudworth. --