1 Law:: vitiate <… he becomes, by the common law, a trespasser ab initio, so that the legality of his first proceedings is vitiated by the subsequent illegal acts – JBS>
فرهنگ تشریحی - کاربردی حقوق تالیف هرمز رشدیه
2 Law:: invalidate (NOTE: باطل ساختن is slightly more formal than باطل كردن but otherwise the two are synonymous and interchangeable in most contexts)