exculpate
verb
[ ˈɛkskʌlpeɪt ]
• show or declare that (someone) is not guilty of wrongdoing.
• "the article exculpated the mayor"
Origin:
mid 17th century: from medieval Latin exculpat- ‘freed from blame’, from the verb exculpare, from ex- ‘out, from’ + Latin culpa ‘blame’.