Definition
A suit is the formal prosecution of a claim, right, or remedy before a court of justice. In modern usage, the term is functionally synonymous with "action" or "lawsuit" and encompasses any civil proceeding initiated by one party against another seeking judicial relief. The word encompasses the entire proceeding from commencement through judgment.
As Chief Justice Marshall articulated — and as Burrill preserves — a suit is "the prosecution of some demand in a court of justice," a definition capacious enough to cover the range of civil proceedings: actions for damages, suits in equity seeking injunctive or declaratory relief, and petitions for specific judicial orders. In contemporary practice, procedural codes (such as the Federal Rules of Civil Procedure) use "action" as the governing term of art, but "suit" retains full currency in statutes, judicial opinions, and common legal usage without meaningful distinction.
Common Language
Modern common usage (Wiktionary): A set of matching clothes worn together, especially a man's jacket and trousers; colloquially, a corporate manager or supervisor; or a set of playing cards sharing a symbol.
Historical common usage (Webster's 1913): The act of following or pursuing, as game; the act of wooing in love; solicitation generally; any earnest endeavor toward an end.
The gap is wide but mostly harmless: a researcher encountering "suit" in a legal context will rarely confuse it with clothing or courtship. The more instructive note is that the older English senses — following, pursuit, solicitation — are not merely colorful trivia. They illuminate the historical legal meaning directly. A suit was a following of one's claim through the machinery of justice, and the obsolete phrase "making fresh suit" (immediate pursuit of a wrongdoer) connects the legal term to its literal root in a way that helps decode early common-law sources.
Common Confusion
Suit vs. Action: In modern federal practice and most state procedural codes, "action" is the preferred and technically correct term. "Suit" and "action" are used interchangeably in most contexts, but some statutes — particularly those conferring or limiting jurisdiction — use one term specifically. Courts have occasionally been asked whether a statutory reference to "suits" encompasses all civil actions or only a subset. Researchers should not assume the terms are always perfectly coextensive in a given statutory scheme.
Suit vs. Proceeding: A "proceeding" is broader than a suit. Administrative proceedings, arbitrations, and ancillary motions within a case may be "proceedings" without constituting independent suits. Context matters when a statute limits rights or remedies to one category but not the other.
Recognized Forms
/SUBTYPES
Representative suit: A suit brought by one member of a class on behalf of all similarly situated members. The plaintiff controls the litigation and may ordinarily discontinue or compromise the action. The modern class action under Rule 23 is the institutionalized descendant of this form, though with significant procedural constraints the historical representative suit did not impose.
Citizen suit: A statutory mechanism allowing private individuals to sue to enforce public laws — most prominently in environmental statutes — without being the direct injured party in the traditional sense. Standing requirements and notice provisions vary by statute.
Suit in equity: Historically distinct from an action at law, a suit in equity was brought before a court of chancery seeking remedies unavailable at common law (injunctions, specific performance, accounting). The merger of law and equity under modern procedural codes has largely dissolved this distinction procedurally, but the terminology persists in statutes, the Seventh Amendment's jury trial guarantee, and constitutional sovereign immunity analysis.
Suit against a state: A suit naming a state as defendant, subject to the Eleventh Amendment's sovereign immunity framework. Whether a proceeding qualifies as a "suit against a state" — as opposed to a suit against a state officer — is a recurring and significant constitutional question.
Why It Matters in Research
Terminology shifts matter. Federal and state procedural reforms of the twentieth century displaced "suit" as the governing term in procedural rules, substituting "action." A researcher mining nineteenth- and early twentieth-century sources will encounter "suit" as the standard word; post-merger sources may use either. The terms travel together, but a statute's deliberate choice of one over the other may carry interpretive weight, particularly in jurisdictional and immunity contexts.
Historical uses require special attention. In old English law, "suit" carried meanings entirely disconnected from modern judicial proceedings: "suit of court" was the feudal obligation of a tenant to attend the lord's court; "suit" referred to the plaintiff's witnesses or followers (secta); "fresh suit" described immediate pursuit of a thief. These senses appear in English legal sources through the eighteenth century and surface in Blackstone. American researchers encountering these phrases in colonial-era documents or early treatises should not read them as references to civil litigation.
The sovereign immunity corpus is a critical intersection. The Eleventh Amendment's text bars "suits in law or equity" against states by citizens of other states or foreign nations, and the Supreme Court's subsequent expansion of that immunity turns heavily on what counts as a "suit against a state." Researchers in this area must track how courts have interpreted that phrase over time, because the word "suit" in the constitutional text is doing substantial doctrinal work.
Citizen suit provisions in environmental and civil rights statutes represent a distinct research domain. These statutes use "suit" as a term of art with specific procedural prerequisites — notice periods, exhaustion questions, fee-shifting provisions — that differ from ordinary civil litigation. The Law Mind Administrative Law Encyclopedia entry on environmental enforcement is the right starting point.
Historical Dictionary Support
The historical dictionaries converge on the core definition without significant divergence. Burrill is the most analytically useful, tracing the etymology through the Latin secta (from sequi, to follow) and the Old French, and quoting Marshall's formulation directly: "the prosecution of some demand in a court of justice." Black's (both editions) reproduce the same essential definition and preserve the historical English senses — witnesses/followers, fresh suit, suit of court — that Burrill also flags.
Anderson's dictionary does not provide a substantive entry on "suit" in the excerpted material, though the surrounding Latin maxims (sua sponte, sui juris) situate the source in the same conceptual vocabulary.
What the historical dictionaries collectively underemphasize: the procedural merger of law and equity, and the emergence of citizen suits and class actions as distinct doctrinal forms. These developments postdate the primary historical sources and require supplementation from twentieth-century treatises and statutory materials. Researchers should not treat the historical dictionary definitions as capturing the full modern scope of the term.
Jurisdictional Note
Most American jurisdictions use "suit" and "action" interchangeably in ordinary practice, but individual state statutes may draw distinctions. Louisiana, with its civil law heritage, presents unique considerations regarding the framing of civil proceedings. Federal jurisdictional statutes — particularly those involving sovereign immunity and the Eleventh Amendment — have generated a body of case law specifically interpreting "suit" as a constitutional and statutory term that does not map cleanly onto state procedural terminology.
Encyclopedia Cross-Reference
The Law Mind Constitutional Law Encyclopedia — "The Eleventh Amendment: Sovereign Immunity and Suits Against States"
The Law Mind Administrative Law & Government Encyclopedia — "Environmental Enforcement: Citizen Suits, Penalties, and Criminal Prosecution"
The Law Mind Real Estate Transactions & Construction Encyclopedia — "Build-to-Suit Agreements: Development, Lease, and Delivery Obligations" (for the specialized transactional usage of "suit" in that context)