The Collaborative International Dictionary of English v.0.48:
Exculpate \Ex*cul"pate\, v. t. [imp. & p. p. Exculpated, p.
pr. & vb. n.. Exculpating (?).] [L. ex out + culpatus, p.
p. of culpare to find fault with, to blame, culpa fault. See
To clear from alleged fault or guilt; to prove to be
guiltless; to relieve of blame; to acquit.
He exculpated himself from being the author of the
heroic epistle. --Mason.
I exculpate him further for his writing against me.
Syn: To exonerate; absolve; clear; acquit; excuse; vindicate;