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usually uncountable, plural mortmains
(law) The perpetual, inalienable possession of lands by a corporation or non-personal entity such as a church. quotations examples
[W]e do hereby grant our especial license and authority unto all and every person […] to grant sell alien and convey in mortmain unto and to the use of the said Society and their successors […]
1824, Charter of Incorporation of the Royal Asiatic Society of Great Britain and Ireland
Though in truth it was the law of mortmain […] which originally sent the founders of chantries to seek the king's licence […]
1900, Frederic William Maitland, “The Corporation Sole”, in Law Quarterly Review, volume 16
(literary) A strong and inalienable possession. quotations examples
[…] ; and some part of that influence [of the government], which would otherwise have been possessed as in a sort of mortmain and unalienable domain, returned again to the great ocean from whence it arose, […]
1770, Edmund Burke, Thoughts on the Present Discontents, and Speeches