Exonerate

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late Middle English: from Latin exonerat- ‘freed from a burden’, from the verb exonerare, from ex- ‘from’ + onus, oner- ‘a burden’.

wiktionary

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From Latinexonerāt-, the participle stem of exonerāre, from exonerō(“to discharge, unload; to exonerate”), from ex-( prefix denoting privation) + onerō(“to burden, lade; to load”) (from onus(“burden, load”), from Proto-Indo-European *h₃énh₂os(“burden, load”), from *h₃enh₂-(“to charge, onerate”)). The English word is cognate with French exonérer.

etymonline

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exonerate (v.)

1520s, "to unload, disburden," a literal sense now obsolete; 1570s as "relieve (of a charge, blame, etc.) resting on one; clear of something that lies upon the character as an imputation," from Latin exoneratus, past participle of exonerare "remove a burden, discharge, unload," from ex "out, out of, off" (see ex-) + onerare "to unload; overload, oppress," from onus (genitive oneris) "burden" (see onus). Related: Exonerated; exonerating.