ex·cul·pate 
(ĕkskəl-pāt′, ĭk-skŭl-)
(ĕkskəl-pāt′, ĭk-skŭl-)tr.v. ex·cul·pat·ed, ex·cul·pat·ing, ex·cul·pates
To clear of guilt or blame.
[Medieval Latin exculpāre, exculpāt- : Latin ex-, ex- + Latin culpa, guilt.]
ex·culpa·ble (ĭk-skŭlpə-bəl) adj.
ex′cul·pation n.