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Adjective: mitigatory  'mi-tu-gu,to-ree [N. Amer], ,mi-ti'gey-tu-ree [Brit]
  1. Moderating pain or sorrow by making it easier to bear
    "The mitigatory effects of the medication provided much-needed relief";
    - alleviative, alleviatory, lenitive, mitigative, palliative

See also: moderating