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tr.v. mit·i·gat·ed, mit·i·gat·ing, mit·i·gates
1. To make less severe or intense; moderate or alleviate. See Synonyms at relieve.
2. To make alterations to (land) to make it less polluted or more hospitable to wildlife.
Phrasal Verb:
mitigate against Usage Problem
1. To take measures to moderate or alleviate (something).
2. To be a strong factor against (someone or something); hinder or prevent.

[Middle English mitigaten, from Latin mītigāre, mītigāt- : mītis, soft + agere, to drive, do; see act.]

mit′i·ga·ble (-gə-bəl) adj.
mit′i·ga′tion n.
mit′i·ga′tive, mit′i·ga·to′ry (-gə-tôr′ē) adj.
mit′i·ga′tor n.
Usage Note: Mitigate, meaning "to make less severe, alleviate" is sometimes used where militate, which means "to cause a change," might be expected. The confusion arises when the subject of mitigate is an impersonal factor or influence, and the verb is followed by the preposition against, so the meaning of the phrase is something like "to be a powerful factor against" or "to hinder or prevent," as in His relative youth might mitigate against him in a national election. Some 70 percent of the Usage Panel rejected this usage of mitigate against in our 2009 survey. Some 56 percent also rejected the intransitive use of mitigate meaning "to take action to alleviate something undesirable," in What steps can the town take to mitigate against damage from coastal storms? Perhaps the use with against in the one instance has soured Panelists on its use in the other. This intransitive use is relatively recent in comparison with the long-established transitive use, so novelty might play a role as well.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in classic literature ?
Side by side, again, with war and love, appears in the romances medieval religion, likewise conventionalized and childishly superstitious, but in some inadequate degree a mitigator of cruelty and a restrainer of lawless passion.
The top jockey can steer Christine Dunnett's charge home after his respectable third behind Mitigator here last time.
Mitigator (3.10 Wolverhampton) won at Yarmouth (1m) hcp.
Performance of the day The Lydia Pearce-trained Mitigator exploited a rapidly tumbling mark when scoring at Lingfield last month and accounted for his rivals off a 3lb higher rating in the mile handicap at Yarmouth.
For product features or attributes with associated uncertainty or excessive risk, the ability to adjust the design's balance can be a valuable risk mitigator. Changing the design--even conveniently via a modular approach--implies new regulatory filings or rationales, manufacturing and supply chain adjustments, and so on.
Instead, countries over-relied on finance, competing to be financial centers and falling into the trap of believing that financial engineering was not just a risk mitigator, which proved wrong, but also an engine of sustainable growth.
Merlot, the easy-going mitigator, also needs a partner.
"We believe an uncompromised commitment to quality creates great competitive advantage for us and for our customers, and will allow Columbia to be a risk mitigator and growth catalyst for our customers."
First, you don't know if the company is recommended or certified by the state as an approved Haz-Mat mitigator. Second, they've made no formal written proposal of their remediation process or protocol.