Alibi
ALIBI (Lat. for "elsewhere"), in law, the defence resorted to in criminal prosecutions, where the person charged alleges that he was so far distant at the time from the place where the crime was committed that he could not have been guilty. An alibi, if substantiated, is the most conclusive proof of innocence.
Note - this article incorporates content from Encyclopaedia Britannica, Eleventh Edition, (1910-1911)