Exculpate
/ˈekskʌlpeɪt/
Definition 1 of 1
Pro Tip 1/3Legal Context
Used mainly in legal situations to discuss innocence. 
The new testimony could exculpate the suspect.
Pro Tip 2/3Not Just Courts
Although legal, it's also used in everyday situations to stress innocence. 
She provided an alibi to exculpate herself from the accusation.
Pro Tip 3/3Formal Tone
It's a formal word, suitable for serious discussions or writings. 
In his article, he attempts to exculpate the politician.