1) Acquittal 2) Excuse 3) Exemption 4) Extenuation 5) Pardon 6) Vindication 1) Alibi 2) Defence 3) Defense 4) Excuse 5) Self-justification 6) Vindication 
• (n.) The act of exculpating from alleged fault or crime; that which exculpates; excuse.
Ex`cul·pa'tion noun [ Confer Late Latin exculpatio .] 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. 
[n] - the act of freeing from guilt or blame
exculpation 1. The act of freeing from guilt or blame. 2. A defense of some offensive behavior or some failure to keep a promise, etc.
noun the act of freeing from guilt or blame
the act of freeing from guilt or blame