WordNet sense 1 (of or relating to or having the nature of retribution):

retaliatory, retributive, relatiative, retributory

WordNet sense 2 (inflicting punishment):

punitive, punitory

WordNet sense 3 (used especially of what is legally or ethically right or proper or fitting):

just

WordNet sense 4 (providing justification):

justificatory, justificative

WordNet sense 5 (clearing of guilt or blame):

exculpatory