Definition
The heading or identifying section of a legal document or court filing. In modern practice, caption refers most commonly to the formal heading of a pleading or other court paper, which identifies the court, the parties, the case number, and the nature of the document. It is the structured block at the top of a complaint, motion, brief, or order that tells the reader at a glance where the document belongs and who the parties are.
The term carries two additional, older meanings that remain legally operative in specific contexts:
1. Caption as document header: The formal heading of any legal instrument — complaint, indictment, affidavit, deposition, or court order — containing the identifying particulars of the proceeding. This is the dominant modern usage.
2. Caption of a commission or deposition: The certificate appended to a deposition or commissioner's proceeding, attesting where, when, and by whose authority the examination was taken. Historically, this was the most technical usage of the term.
3. Caption as arrest or seizure: An archaic usage, now largely obsolete in Anglo-American law, referring to the physical taking of a person or thing — an arrest, seizure, or capture. This meaning persisted in common law pleading and is found extensively in older authorities.
Common Language
Modern common usage (Wiktionary): A descriptive heading or title of a document or section; a title or brief explanation attached to an illustration, cartoon, or user interface element; subtitles or on-screen text in film and broadcast.
Historical common usage (Webster's 1913): The heading of a chapter, section, or page; also, the act of arresting a person by judicial process; and the part of a legal instrument showing where, when, and by what authority it was taken.
The gap between common and legal meaning is modest but worth noting. Everyday usage treats a caption as explanatory text beneath an image or as subtitles in media. Legal usage treats caption as the identifying header of a court document — a structural and mandatory component, not supplementary description. The illustration-caption sense is the reverse of the legal sense: common captions explain what sits above them; legal captions command what follows beneath them.
Common Confusion
Two distinctions regularly trip up researchers:
Caption vs. title of the action: Some courts and procedural rules use these interchangeably. Others treat the caption as the full heading block (court, parties, case number, document type) and the title of the action as just the party names. Context determines which meaning applies.
Caption (modern) vs. caption (archaic arrest sense): Researchers working in pre-nineteenth-century materials will encounter caption used squarely to mean arrest or seizure, with no connection to document headings. Burrill flags that this meaning was already obsolete in English law by the time of his writing. Anderson's Dictionary treats arrest and seizure as the primary meaning. The shift in dominant usage from seizure to heading occurred gradually through the nineteenth century, and older authorities may use both meanings without distinguishing them.
Recognized Forms
/SUBTYPES
Caption of an indictment: The formal commencement or preamble of an indictment, identifying the court, the grand jury, the term, and the venue. In older criminal procedure, defects in the caption of an indictment could be grounds for challenge, making precision in this element legally consequential.
Caption of a deposition or commission: The certificate preceding a deposition or commissioner's examination, stating the time, place, authority, and parties present. Completeness of this certificate affects the admissibility of the deposition.
Caption of a pleading or motion (modern): The standardized heading block required by court rules on all papers filed in a case. Federal Rule of Civil Procedure 10(a) codifies this requirement for federal practice.
Why It Matters in Research
The word caption in historical legal sources does not reliably mean what it means today. Researchers using Burrill, Rapalje, or early American case reporters should treat every appearance of caption as potentially ambiguous until context resolves whether it means a document heading, an arrest, or a deposition certificate. Burrill's entry leads with the arrest meaning and expressly notes its obsolescence; Anderson's leads with seizure and recaption. Black's (both editions) pivots immediately to the document-heading meaning. This reflects a genuine shift in the word's center of gravity across the nineteenth century.
For criminal procedure research, the caption of an indictment was a formal pleading element with independent legal significance under common law practice. Errors in the caption — wrong court, wrong term, omission of venue — appeared in early American cases as substantive grounds for quashing indictments. This gives caption a procedural weight in historical criminal records that it no longer carries in modern practice.
For civil procedure research, the modern caption requirement descends from older pleading conventions but is now governed by court rules rather than common law. Variations in what the caption must contain (party designations, attorney information, judge's name) differ across federal courts, state courts, and administrative tribunals.
For researchers navigating deposition practice in equity or pre-code pleading, the caption of a commission is a distinct and technically specific component. Its absence or defect goes to the competency of the deposition as evidence, and secondary sources on evidence and equity procedure address it separately from the general heading sense.
Historical Dictionary Support
The five source dictionaries present a coherent but layered picture. Black's (1st and 2nd editions) organize the definition around the document-heading sense, noting the indictment and commission usages specifically. Both editions cite cases involving indictments, confirming that caption as a pleading element generated real litigation. Rapalje & Lawrence traces the Latin root captio and gives both the arrest meaning and the judicial-history meaning, illustrating with Taylor v. Clemson for the latter. Burrill is the most comprehensive historically: he distinguishes arrest of person, seizure of thing, certificate of commission, and heading of a legal document, and explicitly flags that the arrest meaning was obsolete in English law by the mid-nineteenth century. Anderson leads with arrest and recaption, connecting caption to the common law self-help remedy of recaption — a connection the other dictionaries do not foreground.
Webster's 1913 is valuable here because it bridges legal and common usage, giving the document-heading sense alongside the arrest sense and the ordinary chapter-heading meaning. This confirms that by 1913 the everyday sense of caption as a heading had already overtaken the arrest meaning in general usage, while legal texts were consolidating around the court-document meaning. None of the historical dictionaries anticipates the modern procedural specificity of caption as a court rule requirement, because that codification — at least in federal practice — came with the Federal Rules of Civil Procedure in 1938.
Jurisdictional Note
Federal practice is governed by FRCP 10(a), which specifies what a caption must contain in civil filings. State courts vary: some follow analogous rules closely, others have distinct requirements for party designations, case types, or judicial assignment information. In criminal practice, the significance of a defective caption in an indictment has largely been absorbed into harmless-error doctrine in modern courts, though the formal requirement persists.
Encyclopedia Cross-Reference
Law Mind Encyclopedia — Pleadings and Court Documents
Law Mind Encyclopedia — Criminal Procedure: Indictments and Informations
Law Mind Encyclopedia — Deposition Practice and Commissions