ETYM Latin commutabilis.
1. Capable of being exchanged for another or for something else that is equivalent; SYN. substitutable.
2. Subject to alteration or change.
ETYM Cf.French échangeable.
1. Capable of replacing or changing places with something else; SYN. interchangeable, similar, standardized.
2. Suitable to be exchanged.
ETYM Cf. Old Fren. entrechangeable.
(Mathematics, logic) Such that the arguments or roles can be interchanged.