Definition
To alienate property is to transfer title or ownership to another person. The term encompasses voluntary conveyances by sale, gift, deed, or will, and is understood in American and English law to require an actual transfer of title — not merely a possessory change or encumbrance short of full conveyance. The word "alien" is used interchangeably in historical sources and carries the same meaning.
In family law, alienate carries a distinct secondary meaning: to conduct that estranges a child from a parent, typically by one parent's deliberate interference with the child's affection for or relationship with the other. This usage is the basis of the doctrine of parental alienation.
Common Language
Modern common usage (Wiktionary): To estrange; to withdraw affections or attention from; to make indifferent or averse, where love or friendship before subsisted. Also, to convey or transfer to another, as title, property, or right.
Historical common usage (Webster's 1913): Estranged; withdrawn in affection; foreign — as in "alienate from God" (Milton).
Editorial note: The common meaning — emotional estrangement — is almost entirely absent from property law usage, where alienate is a term of precision meaning title transfer. The collision between these two meanings is not merely semantic: in family law, the emotional sense has generated its own substantial legal doctrine (parental alienation), entirely distinct from property transfer. Researchers working across practice areas should not assume context will make the operative meaning obvious.
Common Confusion
Alienate and encumber are sometimes conflated in discussions of restraints on property use. An encumbrance (mortgage, lien, easement) does not alienate property — it burdens title without transferring it. Historical sources are explicit on this point: Black's Law Dictionary states that "any transfer of real estate, short of a conveyance of the title, is not an alienation of the estate." A foreclosure entry to enforce a lien, for instance, does not itself alienate the property. Researchers reading restraint-on-alienation clauses in trust instruments or deeds must apply this narrower definition to determine whether a given transaction triggers the clause.
Why It Matters in Research
The dual-meaning problem is the primary research hazard. Corpus searches on "alienate" or "alienation" will surface both property-transfer materials and family law materials on parental alienation — two bodies of law with almost no doctrinal overlap. Filtering by context (trust instruments, deeds, and conveyancing materials on one side; custody proceedings and psychological literature on the other) is essential before drawing any conclusions.
Within property law, the scope question matters historically. Early common law recognized alienation as a right of freeholders to divert property from the natural heir — the power to alienate was itself a privilege, not a default. Restraints on alienation in deeds and trust instruments invoke this history and remain a live issue in spendthrift trust doctrine, where the question is precisely whether a beneficiary's interest can be transferred to creditors. The Law Mind encyclopedia entry on spendthrift trusts addresses how courts define alienation for purposes of those restraint clauses.
Scotch conveyancing practice, flagged in Burrill and both Black's editions, is a minor but notable jurisdictional marker: "sell, alienate, and dispone" was the formal triplet in Scottish heritable property transfers. This language occasionally appears in historical American deeds with Scottish-influenced drafting and should not be read as surplusage.
In family law research, parental alienation as a legal concept is contested — courts vary considerably in how much evidentiary weight they assign to alienation claims and whether they treat it as a diagnosable condition or a behavioral pattern. The Law Mind encyclopedia entries on parental alienation and custodial interference provide the doctrinal grounding researchers need before approaching case law on this issue.
Historical Dictionary Support
The historical sources are in close agreement on the property meaning. Black's (both editions), Bouvier's, Burrill's, and Anderson's all define alienate as to convey or transfer title, and all note that "alien" is the more common English and American form. Burrill explicitly subordinates "alienate" to the "alien" entry as the preferred term in practice.
Anderson's adds the most historical texture, noting that the right to alienate realty was originally conceived as the owner's right to divert property from the heir — a framing that situates alienation within feudal property structure rather than modern contract freedom. This context is useful for researching restraint-on-alienation doctrines, which have their roots in exactly this historical tension between owner autonomy and heir expectation.
What the historical dictionaries do not address is the family law usage. That meaning is entirely absent from the 19th-century sources, reflecting how recently parental alienation emerged as a recognized legal and psychological concept. Researchers should not expect historical dictionary support when working on the family law dimension of this term.
Jurisdictional Note
Restraints on alienation in trust instruments are subject to the Rule Against Perpetuities in most U.S. jurisdictions, but many states have modified or abolished the rule, affecting how broadly alienation can be restricted. In the family law context, the legal weight given to parental alienation claims varies significantly by jurisdiction, with some courts treating it as a factor in custody modification and others approaching it with skepticism absent concrete behavioral evidence.
Encyclopedia Cross-Reference
Spendthrift Trusts — Restraints on Alienation and Creditor Access (The Law Mind Trusts, Estates & Probate Encyclopedia)
Parental Alienation — Assessment and Judicial Response (The Law Mind Family Law Encyclopedia)
Interference with Parental Rights (The Law Mind Family Law Encyclopedia)