the quality of being changeable; having a marked tendency to change

capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability

(mathematics, logic) such that the arguments or roles can be interchanged

(geometry) the interchangeability of the roles of points and planes in the theorems of projective geometry

the quality of being transferable or exchangeable

the quality of being exchangeable (especially the ability to convert a currency into gold or other currencies without restriction)

the quality of not being exchangeable

exchangeability by virtue of being replaceable