exonerate

From Middle English exoneraten (attested in past participle exonerated), from Latin exonerātus, past perfect participle of exonerō (“to discharge, unload; to exonerate”), see -ate (verb-forming suffix). Exonerō is from ex- (“out, from”) + onerō (“to burden, lade; to load”) further from onus (oner-) (“a burden, load”) + -ō (first conjugation verb-forming suffix), from Proto-Indo-European h₃énh₂os (“burden, load”), from h₃enh₂- (“to charge, onerate”). Compare French exonérer.

Learned borrowing from Latin exonerātus (more at etymology 1), see -ate (adjective-forming suffix).