Definition
The process by which land or tenements were transferred into mortmain — that is, into the permanent, inalienable ownership of a corporate or ecclesiastical body such as a church, monastery, or other perpetual institution. Under the feudal system, admortization described the act or effect of such a transfer, by which property became, as the term mortmain implies, held by a "dead hand" incapable of the feudal services and incidents that normally flowed from land tenure. The lord of the fee lost his rights to feudal dues, escheat, and other incidents when his tenant alienated land to a perpetual body that could never die, marry, or come of age — triggering none of the customary feudal windfalls. Statutes of mortmain, beginning in England with the Statute of Mortmain (1279), were enacted specifically to restrain the practice.
Common Confusion
Admortization and mortmain are not the same thing, though they are inseparable in meaning. Mortmain refers to the state of perpetual corporate or ecclesiastical land ownership — the condition itself. Admortization refers to the transfer or reduction of land into that state — the process. In practice, historical sources sometimes use the terms interchangeably, but the technical distinction is that admortization is the act, mortmain is the result.
Why It Matters in Research
Admortization is a term of almost exclusively historical significance. Researchers will encounter it in medieval and early modern English legal sources, in treatises on feudal tenure, and in commentary on the Statutes of Mortmain. It will rarely, if ever, appear in modern litigation or statutory materials. Its importance lies in understanding the feudal background against which mortmain restrictions developed and why legislatures found it necessary to regulate land transfers to perpetual bodies.
The practical research trap here is treating admortization as a synonym for mortmain itself. The two are related but distinct: mortmain is the condition of perpetual corporate or ecclesiastical ownership; admortization is the act or process by which that condition comes about. A researcher working through historical conveyancing records, ecclesiastical property disputes, or early American land-grant materials that borrow from English feudal vocabulary should be alert to this distinction.
Admortization also connects to the broader question of alienation restraints in property law. The policy concern animating the Statutes of Mortmain — that land was being removed from the productive feudal economy and concentrated in inalienable religious hands — is the same concern that underlies later doctrines about restraints on alienation, the Rule Against Perpetuities, and modern nonprofit property regulations. Researchers tracing the intellectual lineage of those doctrines will find admortization a useful point of origin.
Historical Dictionary Support
The historical sources are in complete agreement and nearly identical in wording: all three — Black's first edition, Black's second edition, and Rapalje & Lawrence — define admortization as "the reduction of property of lands or tenements to mortmain, in the feudal customs." Webster's 1913 and Wiktionary mirror this definition precisely, which is itself informative: there is no divergence between common and legal meaning because the term had no life outside the law. It was a term of legal art from the beginning, and the dictionaries, legal and general alike, simply forwarded the same feudal-law definition.
What the historical sources do not provide is context or elaboration. None of the source dictionaries explains the policy significance of admortization, the mechanics of how it occurred, or its relationship to the statutory framework designed to prevent it. A researcher relying solely on these entries would know the definition but not why it mattered. For that context, Bracton, Littleton's Tenures, and Coke on Littleton remain the foundational primary sources; Blackstone's Commentaries, Book II, addresses mortmain and the restrictions imposed by statute in accessible detail.
The Rapalje & Lawrence entry is notable for appending, without transition, the definitions of adnepos and adneptis — terms relating to degrees of consanguinity — suggesting that the compilers treated admortization as a minor entry requiring no independent elaboration before moving on.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Mortmain; Feudal Tenure; Restraints on Alienation.