The Collaborative International Dictionary of English v.0.48:
Justificatory \Jus*tif"i*ca*to*ry\ (?; 277), a. Vindicatory; defensory; justificative. [1913 Webster]WordNet (r) 3.0 (2006):
justificatory adj 1: attempting to justify or defend in speech or writing [syn: defensive, justificative, justificatory] 2: providing justification [syn: justificative, justificatory, vindicatory]