Definition
Corpus (Latin: body) is a foundational legal term with several distinct meanings depending on context. Its common thread is the idea of a concrete, substantial thing — as opposed to something abstract, inchoate, or merely conceptual.
1. Physical body. The body of a living or deceased person. Appears in procedural contexts (habeas corpus: produce the body) and in evidentiary rules (corpus delicti: the body of the crime, i.e., the fact that a crime was actually committed).
2. Principal sum or capital. In trust and estate law, the corpus is the principal of a trust or estate — the underlying property itself — as distinguished from the income or interest it generates. A trust beneficiary entitled to "income" receives earnings; one entitled to "corpus" receives the underlying asset or its value.
3. Body of law or aggregate. A corpus of laws, statutes, or rules treated as a unified whole. Used to describe a complete or definitive collection: the corpus juris (body of law).
4. Substance versus conception. More broadly, corpus denotes the actual, physical substance of a thing as opposed to an intellectual or legal abstraction. A document is the corpus; the rights it represents are something else.
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Common Language
Modern common usage (Wiktionary): A collection of written or spoken texts; an electronic database of texts used for linguistic analysis; the body of a man or animal; a collection of objects with similar characteristics.
Historical common usage (Webster's 1913): "A body, living or dead; the corporeal substance of a thing."
The ordinary English senses of corpus have largely migrated into academic linguistics, where the term now primarily connotes a curated body of texts. The legal senses are narrower and more technical: legal corpus does not mean a text collection, but rather a physical body, a principal sum, or the tangible substance of a legal fact or relationship. A researcher encountering corpus in a legal document should not default to the modern linguistic meaning.
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Common Confusion
Three uses of corpus generate persistent confusion in legal research:
Corpus versus corpus delicti. Corpus alone means body or principal. Corpus delicti is a specific legal doctrine requiring proof that a crime actually occurred before a conviction can rest on a confession. The two are related etymologically but function as independent legal concepts with entirely separate doctrinal histories.
Corpus (trust principal) versus income. Beneficiaries, executors, and courts have long disputed whether particular receipts — such as stock dividends, mineral royalties, or insurance proceeds — belong to corpus or income. The classification has real distributional consequences and is governed by trust instruments, state principal-and-income acts, and judicial interpretation. Treating corpus as a synonym for "assets generally" misses this operative distinction.
Corpus juris versus corpus of a specific document. Corpus juris refers to the entire body of law of a legal system or a comprehensive legal compilation (e.g., Corpus Juris Civilis, Corpus Juris Secundum). Corpus of a trust or will refers only to the specific property comprising that instrument. Context disambiguates, but historical sources sometimes use corpus loosely.
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Recognized Forms
/SUBTYPES
Corpus delicti — The body of the crime; the fact that a criminal act has actually been committed. A rule of evidence requiring the prosecution to establish the actuality of the crime independently of the defendant's confession or admission.
Corpus juris — The body of the law; the complete system of law of a jurisdiction or legal tradition. Also the name of authoritative American legal encyclopedias (Corpus Juris, Corpus Juris Secundum).
Habeas corpus — "You shall have the body." A writ commanding that a detained person be brought before a court to determine the legality of detention. One of the most significant procedural rights in Anglo-American law.
Corpus of a trust — The trust res; the property transferred to and held by the trustee, as distinguished from the income produced by that property.
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Why It Matters in Research
Corpus is a navigational term as much as a substantive one. Researchers encounter it in at least four distinct doctrinal territories — criminal evidence (corpus delicti), constitutional procedure (habeas corpus), trusts and estates (trust corpus), and jurisprudence (corpus juris) — and the relevant sources for each are almost entirely non-overlapping. Pulling cases on corpus delicti will not help a researcher analyzing trust corpus distribution disputes, and vice versa.
In trust and estate research, the corpus/income distinction is one of the most litigation-prone issues in the field. State principal-and-income statutes have changed significantly over the twentieth century, and what was classified as corpus in older authority may be reclassified as income under modern uniform acts, or the reverse. Historical decisions on this question must be read against the statutory regime then in force.
In criminal research, corpus delicti doctrine varies by jurisdiction in ways that are easy to underestimate. Some jurisdictions have weakened or modified the corroboration requirement; others retain it in traditional form. Citing a corpus delicti case without confirming the applicable jurisdiction's current standard is a research error.
For habeas corpus research, the term itself is almost a false entry point. The modern doctrine is dominated by statutory overlay — particularly the Antiterrorism and Effective Death Penalty Act of 1996 — and the common law writ bears limited resemblance to the federal habeas procedure available today. Historical dictionary entries on habeas corpus reflect the writ's pre-AEDPA character and must be used with care.
The Bouvier's entry in this source set is a mismatch — it defines martial law, not corpus, suggesting a scan or indexing error in the historical source. Researchers relying on Bouvier for this term should locate the correct entry independently.
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Historical Dictionary Support
Black's Law Dictionary (both editions) gives the most complete picture, identifying the principal/capital sense, the physical body sense, and corpus delicti — and correctly flagging corpus as a marker of positive, concrete fact as opposed to equivocal inference. This substantive/evidentiary dimension is underappreciated in modern usage.
Burrill's Law Dictionary adds valuable texture, noting that corpus extends to artificial bodies (corporations) and quoting Digest authority for the proposition that corporations, partnerships, and similar bodies are distinct forms of corpus. Burrill's treatment is more civilian in orientation and reflects the Roman law heritage of the term more fully than Black's.
Anderson's Dictionary of Law correctly notes that corpus functions in several phrases to mean the body or person of an individual — pointing toward the capere-related writs — without elaborating. Useful as a cross-reference prompt, not as a standalone definition.
Rapalje & Lawrence treats corpus only implicitly, through references to "body" in indictment contexts (body of the slain in a murder indictment; body of a violated grave). These entries reflect nineteenth-century pleading requirements that have since been substantially relaxed or codified.
The Bouvier's entry in this source set is plainly a data error (martial law content) and should be disregarded for this term.
No historical dictionary in this set gives adequate treatment to the trust corpus sense — a significant gap, given how much litigation that distinction has generated. Researchers should supplement with treatises on trust administration for historical depth on that usage.
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Jurisdictional Note
The corpus delicti rule varies materially by jurisdiction. Some states require independent corroboration of every element of the crime; others require only that the prosecution establish the corpus delicti — the fact of injury and criminal agency — before a confession may be admitted. Federal courts and some states have moved toward less demanding corroboration standards. Research in this area must be jurisdiction-specific.
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Encyclopedia Cross-Reference
Homicide — Corpus Delicti Requirement (The Law Mind Criminal Law Encyclopedia)
Habeas Corpus — AEDPA Standards and Procedural Barriers (The Law Mind Criminal Law Encyclopedia)
Habeas Corpus — Exhaustion and Procedural Default (The Law Mind Criminal Law Encyclopedia)
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