This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of mitigate.

adj. that serves to mitigate

adj. serving to reduce blame; -- of situations. Opposite of aggravating.

"BEHAR: I know but I worry about the defense coming up with what they call mitigating circumstances."

extenuating    mitigatory    soothing    softening    alleviating    ameliorating    palliative    assuasive    balmy   

mitigate