Kindly refer to the video to get to know the context the word is generally used in.
Exonerate (Verb) :
1. (of an official body) absolve (someone) from blame for a fault or wrongdoing.
Ex. "an inquiry exonerated those involved"
Ex. It's another matter that in the equally sensational TANSI land-deal case, the Supreme Court finally exonerated Jayalalithaa of any wrong-doing.
Synonyms: absolve, clear, acquit, declare innocent, find innocent, pronounce not guilty, discharge.
2. release someone from (a duty or obligation).
Ex. "Pope Clement V exonerated the king from his oath to the barons"
Synonyms: release, discharge, relieve, free, liberate.