vin-di-cate

1. To clear of acusation, censure, suspicion, etc.
2. To defend or maintain, as a right or claim, against challenge or attack  and show to be just, right, and reasonable.
3. To provide justification for; justify.
 

vin-di-ca-tion

1. The act of vindicating, or the state of being vindicated.
2. A justification; defense.
 

and uhmm my personal fave...

vin-dic-tive

Having or characterized by having a vengeful spirit. 

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