MITIGATE Meaning of MITIGATE in English v. a. 1.Moderate, alleviate, assuage, abate, lessen.2.Appease, soothe, soften, mollify, pacify, quiet, still, calm, quell, allay.3.Moderate, temper, attemper.4.Diminish, lessen, abate. Soule. Dictionary of English synonyms. Словарь английских синонимов. 2012