Definition
Conversion is a legal term with three distinct and largely independent meanings depending on the area of law at issue.
(1) Tort law. An intentional tort consisting of an act that so seriously interferes with another person's right to control their personal property that the law requires the defendant to pay the full value of the property rather than merely compensate for temporary deprivation. Conversion goes beyond simple trespass to chattels: the interference must be serious enough — in degree of dominion asserted, duration, harm caused, or intent — to justify treating the defendant as having effectively bought the property at the moment of the wrong. The plaintiff can elect between restitution of the chattel or its full fair market value.
(2) Equity. A legal fiction by which a court of equity treats property as already transformed into its intended form when such transformation is required by the equities of the case. Most commonly arises in the administration of wills and marriage settlements: land directed to be sold is treated as money from the moment the direction becomes operative, and money directed to be invested in land is treated as real property. The doctrine prevents unjust results when the actual conversion has not yet occurred — or never occurs — at the time rights must be determined.
(3) Business organizations. A statutory procedure by which a business entity changes its legal form — for example, a partnership converting to a limited liability company — without dissolving and re-forming. The converted entity retains its liabilities, assets, contracts, and legal continuity. Governed by state organizational statutes; procedures and effects vary by jurisdiction.
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Common Language
Modern common usage (Wiktionary): The act of converting something or someone — changing form, condition, religion, or platform; in sports, scoring points after a touchdown or try; in online advertising, a completed user action such as a purchase or signup.
Historical common usage (Webster's 1913): The act of turning or changing from one state or condition to another; transmutation; also, a change of views, party, or religion — as in "conversion to Christianity."
The ordinary language meaning tracks physical or spiritual transformation and is not entirely misleading, but it misses the critical legal point in each specialized context. In tort law, conversion does not require any transformation of the property itself — what converts is the defendant's legal relationship to it: by exercising serious dominion, the defendant is treated as having taken full title and owes full value. In equity, the "conversion" is explicitly fictitious — no actual change has occurred; the law simply treats property as if it had already changed form. Researchers who import the common meaning risk misreading both the tort element of wrongful dominion and the equitable fiction of notional transformation.
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Common Confusion
Conversion (tort) vs. trespass to chattels. These are related but distinct wrongs on a spectrum. Trespass to chattels covers minor or temporary interferences with personal property; the remedy is actual damages for the loss of use or minor harm. Conversion applies when the interference is serious enough — in degree, duration, or intent — to justify forcing a forced sale at full value. The distinction matters because conversion is an all-or-nothing remedy: the plaintiff receives full value, and title passes to the defendant. Historical sources often discuss these together under the heading of trover, which can obscure the doctrinal line between them.
Conversion (equity) vs. actual sale or transfer. The equitable doctrine of conversion is purely notional. Property subject to an unconditional direction to convert is treated as already converted for purposes of succession, dower rights, and creditor claims — even if the trustees have not acted. Researchers unfamiliar with this fiction may read trust or probate documents and assume a transaction occurred when none did.
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Core Elements
For the intentional tort of conversion, courts generally look to the following factors to determine whether an interference rises to the level of conversion rather than trespass to chattels:
Extent of dominion asserted. The defendant must exercise control inconsistent with the owner's rights — not merely touching or moving the property.
Intent. The act must be intentional, though mistake as to title or ownership is not a defense. Good faith acquisition of stolen goods still constitutes conversion.
Duration of interference. A brief deprivation is less likely to support conversion; permanent or prolonged dispossession typically does.
Harm caused to the property. Destruction or substantial alteration strongly supports conversion.
The owner's loss of use. Whether and how substantially the plaintiff was deprived of the property's value and benefit.
These factors are weighed together; no single element is necessarily dispositive.
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Recognized Forms
/SUBTYPES
Qualified conversion (equity). A conversion directed for a particular limited purpose, as distinguished from an absolute conversion. Bouvier notes that a qualified conversion does not transform the property for all purposes — only for the specific equitable objective that triggered the fiction.
Constructive conversion (tort). An interference that, while lacking the outward appearance of a taking, effectively denies the owner dominion — such as misdelivery of bailed goods or wrongful sale of another's property. Some jurisdictions treat this as a subset of conversion proper; others distinguish it explicitly.
Statutory conversion (business organizations). The formal organizational procedure governed by state LLC, partnership, or corporate statutes, distinct from either the tort or the equitable doctrine. See business_36 for procedural treatment.
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Why It Matters in Research
The three meanings of conversion inhabit the same word but almost never appear in the same legal dispute. A researcher who fails to identify which branch of law is at issue will be led to entirely wrong sources. The equitable doctrine is historically the most elaborately theorized, and Bouvier's and Black's 2nd Ed. entries foreground it heavily — this reflects a 19th-century practice environment in which equity courts regularly resolved trust and succession disputes turning on notional conversion. Modern legal research, particularly in torts, has largely displaced this context, and researchers using historical dictionaries as their entry point may receive an equity-first framing that is unhelpful for tort questions.
In tort research, the critical historical connection is between conversion and the action of trover. Burrill links them directly, and understanding trover — the common-law action that conversion eventually superseded — is essential for reading pre-20th-century case law. Many older decisions discuss "conversion" as an element within trover rather than as a freestanding cause of action. Searching historical case law for conversion without awareness of trover will produce gaps.
For equity researchers, the doctrine of reconversion (the notional undoing of an equitable conversion) is closely related and appears in the same trust and succession contexts. It is underrepresented in the historical dictionary entries excerpted here and must be researched separately.
In business organization research, conversion is entirely statutory and jurisdiction-specific. The word carries no common law baggage in this context, but researchers moving between states must verify the precise statutory procedure and its effects on continuity of obligations, since these vary significantly.
Cross-corpus alert: The Anderson's Dictionary excerpt included in the source material for this entry actually addresses "conversation," not "conversion" — a transcription artifact. Researchers using digitized historical dictionaries should be alert to OCR and transcription errors that may silently substitute similar-looking words, particularly in 19th-century texts.
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Historical Dictionary Support
The historical dictionaries are in general agreement on the equitable doctrine, and both Black's editions frame conversion primarily through this lens before treating the tort. Burrill is the outlier: he leads with the appropriation-of-property meaning, linking conversion directly to trover and Blackstone's Commentaries, and notes explicitly that conversion and "carrying away" are not synonymous — an important refinement showing that the tort does not require physical removal of property. This clarification anticipates a confusion that persists in modern cases.
Bouvier adds useful granularity on the equitable side by distinguishing qualified from absolute conversion, though his entry is fragmentary in the excerpts available. He also signals the intent requirement on the tort side — "with intent so to apply or dispose of it as to alter its condition or interfere with the owner's dominion" — while noting that authority exceeded beyond its scope likewise constitutes conversion. This framing, emphasizing dominion and interference rather than physical taking, tracks the modern doctrinal approach well.
What the historical sources do not address: the business-organization sense of conversion is entirely absent, as expected given its statutory origin in modern LLC and partnership legislation. The modern tort refinement of the spectrum between trespass to chattels and conversion — particularly the "seriousness" balancing approach — is implicit rather than explicit in the historical entries. Researchers relying solely on historical dictionaries will find the tort definition undertheorized relative to the equity doctrine.
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Jurisdictional Note
The intentional tort of conversion is recognized across U.S. common law jurisdictions and in English law, but the threshold for what constitutes sufficient interference varies by state. A minority of states retain statutory versions of conversion or criminal conversion alongside the tort; see criminal_76 for the criminal dimension. The equitable doctrine of conversion is largely obsolete as a practical matter in jurisdictions that have abolished separate courts of equity and modernized trust and probate statutes, though the doctrine may still appear in older instruments being administered today.
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Encyclopedia Cross-Reference
torts_107: Intentional Torts — Property and Economic — Conversion (The Law Mind Torts & Personal Injury Encyclopedia)
criminal_76: Criminal Conversion and Unauthorized Use of Property (The Law Mind Criminal Law Encyclopedia)
business_36: LLCs — Conversion, Merger, and Domestication of LLCs (The Law Mind Business Organizations & Corporate Law Encyclopedia)
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