What is exonerate?

Some articles on exonerate:

List Of The Practice Episodes - Season 4: 1999–2000
... The firm continues the trial, striving against all odds to exonerate Mills ... Meanwhile, Ellenor flies to Pennsylvania to see if there are possibilities that could exonerate a 31-year-old death row inmate who claims to be innocent of a double homicide 19 ... "Till Death ... The only to way to exonerate the client is to manipulate the jury's heartstrings ...