exonerate
verb [ T ]
LAW formal uk/ɪɡˈzɒnəreɪt/ usto show or say officially that someone or something is not guilty of something:
We have proof which will completely exonerate him.
exonerate sb from sth I do not wholly exonerate her from blame.
exoneration
noun [ U ] uk/ɪɡˌzɒnəˈreɪʃən/ us/-ˌzɑːnə-/
He spent much of the rest of his life seeking exoneration.