vindicate in WordNet English dictionary

1. show to be right by providing justification or proof
   "vindicate a claim"
   justify  vindicate 
   
2. clear of accusation, blame, suspicion, or doubt with supporting proof
   "You must vindicate yourself and fight this libel"
   vindicate 
   
3. maintain, uphold, or defend
   "vindicate the rights of the citizens"
   vindicate