Source : Webster's Revised Unabridged Dictionary (1913)

Exoneration \Ex*on`er*a"tion\, n. [L. exoneratio: cf. F.
   Exon['e]ration.]
   The act of disburdening, discharging, or freeing morally from
   a charge or imputation; also, the state of being disburdened
   or freed from a charge.

Source : WordNet®

exoneration
     n 1: the condition of being relieved from blame or obligation
     2: the act of vindicating or defending against criticism or
        censure etc.; "friends provided a vindication of his
        position" [syn: {vindication}]