名詞 mitigation:

1. to act in such a way as to cause an offense to seem less serious
   同義詞：extenuation, palliation
2. a partial excuse to mitigate censure; an attempt to represent an offense as less serious than it appears by showing mitigating circumstances
   同義詞：extenuation
3. the action of lessening in severity or intensity
   同義詞：moderation