exculpation
  使無罪,分辯,辯解
  Ex·cul·pa·tion n.  The act of exculpating from alleged fault or crime; that which exculpates; excuse.
     These robbers, however, were men who might have made out a strong case in exculpation of themselves.   --Southey.
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  exculpation
       n 1: a defense of some offensive behavior or some failure to keep
            a promise etc.; "he kept finding excuses to stay";
            "every day he had a new alibi for not getting a job";
            "his transparent self-justification was unacceptable"
            [syn: excuse, alibi, self-justification]
       2: the act of freeing from guilt or blame