Definition
A debt is an obligation to pay or perform something owed by one person (the debtor) to another (the creditor). In legal usage, the term carries three overlapping but distinct meanings:
1. Narrow (contractual): A specific, fixed sum of money owed under an express agreement — a bond, promissory note, lease reservation, or bargained contract — where the amount is certain and requires no future valuation to determine. This is the classical legal definition and the one most operational in historical pleading and procedure.
2. Broad (general obligation): Any obligation arising from contract, express or implied, that may be discharged by money or performance. Under this wider definition, debt encompasses obligations not immediately reducible to a fixed number, including implied-in-law duties and statutory liabilities.
3. Procedural (the action of debt): Historically, "debt" referred to a specific common law writ and form of action used to recover a liquidated sum. This meaning is largely obsolete in modern procedure but governs the interpretation of older case law and pleadings.
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Common Language
Modern common usage (Wiktionary): Money that one person or entity owes or is required to pay to another, generally as a result of a loan or other financial transaction; also, broadly, any obligation owed to another.
Historical common usage (Webster's 1913): That which is due from one person to another, whether money, goods, or services; that which one person is bound to pay or perform; also used in a moral or spiritual sense ("Forgive us our debts").
The gap between common and legal meaning is one of precision, not direction. Ordinary English treats "debt" as any financial obligation owed — loose, intuitive, and morality-tinged. Legal usage splits on whether the obligation is liquidated (certain in amount) or unliquidated, and whether it arises from express contract or implication. The distinction matters acutely: a legal claim for "debt" historically required a fixed, ascertainable sum, while a claim sounding in damages did not. A researcher who reads "debt" in a common-language source and carries that meaning into legal analysis risks misreading both the remedy available and the procedural vehicle required.
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Common Confusion
Debt vs. Damages: The most persistent confusion in historical sources. A debt is a sum certain, already owed and ascertainable. Damages are a sum determined by the fact-finder to compensate for injury. Before the merger of law and equity and the advent of modern procedural codes, this distinction determined which writ or action was available and which court had jurisdiction. Rapalje & Lawrence make the opposition explicit: debt is "properly opposed to unliquidated damages." Modern courts rarely turn on this line, but historical case research requires it.
Debt vs. Liability: Liability, in older usage, denotes a contingent or inchoate obligation — something that may ripen into a debt but has not yet done so. A surety's obligation before the principal defaults, for example, was a liability; after default, it became a debt. The two terms are frequently collapsed in modern usage and in some statutory schemes, but the distinction remains alive in bankruptcy, guaranty, and suretyship contexts.
Debt vs. Duty: In moral or ecclesiastical contexts, "debt" extended to any obligation of conscience or religious observance. Legal sources, particularly those treating canon law or early common law, sometimes use the term in this expanded sense. Researchers working in ecclesiastical records or equity materials should be alert to this usage.
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Core Elements
For a legal debt to exist in the classical sense, three elements were generally required:
1. A definite obligor and obligee: An identifiable debtor who owes and an identifiable creditor to whom the obligation runs. Debt is personal; it runs between parties.
2. A certain or ascertainable sum: The amount must be fixed or capable of being made certain without a jury's valuation. This is what separated the action of debt from assumpsit and trespass on the case in the common law system.
3. A legal basis for the obligation: Typically express contract, but extended by courts to implied contract and, later, to statutory obligations. The legal-tender statutes and bankruptcy codes pushed this element furthest, importing "debt" to mean any obligation dischargeable in money.
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Recognized Forms
/SUBTYPES
Funded debt: A debt evidenced by formal instruments — bonds, debentures, notes — typically long-term and carrying interest. Characteristic of corporate and governmental finance.
Floating debt: Short-term or unfunded obligations not secured by specific instruments; subject to fluctuation. Common in municipal finance analysis.
Judgment debt: A debt established and fixed by a court's judgment. It carries distinct enforcement mechanisms (execution, garnishment, lien) and a separate limitation period in many jurisdictions.
Privileged or preferred debt: A debt accorded priority in distribution — by statute, by the nature of the creditor (e.g., the United States), or by the character of the claim (e.g., funeral expenses, wages). Bouvier notes this category explicitly in the context of priority and lien.
Contingent debt: An obligation that will become a fixed debt only upon the occurrence of a future event. Treated distinctly in bankruptcy and insolvency law.
Debt of record: A debt established by the record of a court — a judgment or recognizance — as distinguished from a debt by specialty or simple contract.
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Why It Matters in Research
The central research trap: the word "debt" appears in sources spanning nine centuries and carries materially different meanings depending on era, jurisdiction, and procedural context. A researcher who reads "debt" in a 17th-century English common law opinion is looking at a specific writ with fixed pleading rules. The same word in an 1898 federal statute may mean any pecuniary obligation. In a 21st-century consumer protection regulation, it means something defined by the statute itself — often broader than either historical meaning.
Procedural evolution is the key variable. The action of debt — one of the oldest common law forms — required the plaintiff to recover a sum certain. When assumpsit expanded to cover contractual claims, debt's practical scope shrank. When code pleading abolished the forms of action in the 19th century, "debt" as a procedural category effectively disappeared from American courts. But it persisted in substance — and in the vocabulary of statutes, constitutions, and treatises written before and after that transition. Researchers working across that divide must track which meaning of debt the source intends.
Bankruptcy research is particularly sensitive. The Bankruptcy Code (11 U.S.C. § 101) defines "debt" as "liability on a claim" — a deliberately expansive definition that sweeps in contingent, unliquidated, and disputed obligations that classical common law would not have called debts at all. Historical bankruptcy cases and pre-Code treatises use the term more narrowly. Comparisons across that line require care.
Constitutional debt clauses — the Contract Clause, the Fourteenth Amendment's public debt provision, state constitutional debt limitations on municipalities — use "debt" in contexts that courts have construed specifically and sometimes narrowly. The corpus contains significant litigation history on each; the encyclopedia entries cross-referenced above are the recommended starting points.
Marital debt allocation varies sharply by community property versus common law property regime. What a court treats as a "marital debt" subject to equitable distribution or community liability depends on state law and the timing of the obligation's creation. The Family Law Encyclopedia entry on this topic addresses the allocation framework.
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Historical Dictionary Support
The historical dictionaries converge on the Blackstone formulation — a sum certain, due by express agreement — as the core definition, and all major shelf sources quote or paraphrase 3 Bl. Comm. 154. This convergence is informative: it reflects the dominance of the common law writ tradition in shaping how 19th-century legal lexicographers understood the term.
Burrill is the most thorough of the historical sources on this entry, tracing the Latin root (debitum) and the Law French forms (det, dett, dette) before settling into doctrinal explication. He distinguishes, more carefully than the others, between the narrow writ-based definition and the broader general obligation sense that was already encroaching in his time.
Rapalje & Lawrence contribute a meaningful doctrinal note that the other dictionaries understate: the explicit opposition of debt to unliquidated damages, to contingent liability, and to obligations not enforceable at law. This tripartite opposition is the most useful analytical tool the historical dictionaries offer for understanding what debt is not — and it is largely absent from the Black's editions.
What the historical dictionaries miss or underemphasize: the statutory transformation of the term. The legal-tender cases, the federal bankruptcy acts, and the consumer debt legislation of the 20th century pushed "debt" well beyond what any of these sources contemplate. Researchers should treat the historical definitions as governing for pre-20th-century materials and as a baseline — not a ceiling — for later contexts.
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Jurisdictional Note
Community property states treat debt allocation between spouses differently from common law states, with significant consequences for creditor claims against marital assets. Federal bankruptcy law preempts state debt definitions for purposes of the Bankruptcy Code but leaves state law to govern most questions of what property a debt can reach. Several states retain constitutional provisions limiting governmental debt issuance that turn on judicially construed definitions of "debt" specific to that state's case law.
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Encyclopedia Cross-Reference
Consumer Protection — Debt Collection and Garnishment Limitations (The Law Mind Contracts & Commercial Law Encyclopedia)
Corporate Finance — Debt Securities (Bonds, Debentures, Notes) (The Law Mind Business Organizations & Corporate Law Encyclopedia)
Marital Property — Debts and Liabilities: Allocation Between Spouses (The Law Mind Family Law Encyclopedia)
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