ex·on·er·ate 
(ĭg-zŏnə-rāt′)
(ĭg-zŏnə-rāt′)tr.v. ex·on·er·at·ed, ex·on·er·at·ing, ex·on·er·ates
1. To free from blame.
2. To free from a responsibility, obligation, or task.
[Middle English exoneraten, from Latin exonerāre, exonerāt-, to free from a burden : ex-, ex- + onus, oner-, burden.]
ex·on′er·ation n.
ex·oner·a′tive adj.