extenuatio

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
EXTENUATION. That which renders a crime or tort less heinous than it would 
be without it: it is opposed to aggravation. (q.v. ) 
     2. In general, extenuating circumstances go in mitigation of punishment 
in criminal cases, or of damages in those of a civil nature. See 
Aggravation; Mitigation. 
    

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