Exculpate

Part of speech: verb (v.)

To clear from alleged fault or guilt; to prove to be guiltless; to relieve of blame; to acquit. He exculpated himself from being the author of the heroic epistle. Mason. I exculpate him further for his writing against me. Milman.

Synonyms: exonerate; absolve; clear; acquit; excuse; vindicate; justify.