(a.) Tending to, or involving, retaliation; retaliative; as retaliatory measures.

amendatory avenging balancing changeable commutable commutative compensating compensatory convertible counteracting counteractive counterbalancing countervailing equal equalizing equivalent even exchanged expiatory give-and-take grudgeful implacable indemnificatory interchangeable interchanged irreconcilable mutual offsetting penitential permutable punitive punitory rancorous reciprocal reciprocating reciprocative recompensing recompensive rectifying reparative restitutive retaliative retributive retributory returnable revanchist revengeful standard swapped switched traded transposed unappeasable vengeful vindicatory vindictive