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Adjective: justificatory  jús'ti-fu-ku,to-ree [N. Amer], ,jús-ti-fi'key-tu-ree [Brit]
  1. Providing justification
    "The justificatory evidence was compelling";
    - justificative, vindicatory
     
  2. Attempting to justify or defend in speech or writing
    "The politician's justificatory statement did little to quell the controversy";
    - defensive, justificative

See also: apologetic, exculpatory, excusatory