Synonyms for Justificatory (same or very similar meaning)
WordNet sense 1 (attempting to justify or defend in speech or writing):
defensive, justificativeWordNet sense 2 (offering or expressing apology):
excusatoryWordNet sense 3 (providing justification):
vindicatoryWordNet sense 4 (clearing of guilt or blame):
exculpatoryFrom the ODE community, based on WordNetadd/edit