(a.) Capable of being permuted; exchangeable.

able to adapt adaptable adjustable alterable alterative changeable checkered commutable commutative convertible equal equalizing equivalent even ever-changing exchanged flexible fluid give-and-take impermanent interchangeable interchanged kaleidoscopic malleable many-sided metamorphic mobile modifiable movable mutable mutual nonuniform plastic protean proteiform reciprocal reciprocating reciprocative resilient retaliatory returnable rubbery standard supple swapped switched traded transient transitory transposed variable