mitigate

From Middle English mitigaten (“to relieve pain, soothe; (swelling) to abate; (hemorrhoids) to relieve; (the mind) to placate, appease; to end, check; to stop, cease”), from mitigat(e) (“mitigated, alleviated, relived”, also used as the past participle of mitigaten) +‎ -en (verb-forming suffix), borrowed from Latin mītigātus, the perfect passive participle of mītigō (“to make soft, ripe; to tame, pacify”), from mītis (“gentle, mild, ripe”) + -igō (“to do, make”), of uncertain origin, but perhaps from Proto-Indo-European *meh₁y- (“mild, soft”).

From Middle English mitigat(e) (“mitigated”, also used as the past participle of mitigaten and of mitigate in Early Modern English), see -ate (adjective-forming suffix) and Etymology 1 for more.