vin•di•cateˈvɪn dɪˌkeɪt(v.t.)-cat•ed, -cat•ing.

1. to clear, as from an accusation or suspicion:

   to vindicate someone's honor.

2. to afford justification for; justify.

3. to uphold or justify by argument or evidence.

4. to maintain or defend against opposition.

5. to claim for oneself or another.

6. Obs.to avenge.

7. Obs. to free.

8. Obs. to punish.

Origin of vindicate:

1525–35; < L vindicātus, ptp. of vindicāre to lay claim to, to claim as free, v. der. of vindex claimant, protector

vin′di•ca`tor(n.)