Definition
A nisi prius clause is a procedural notation entered on the court record in a common law action at law, authorizing the trial of a case in the county designated for that purpose. The clause directed that the cause be heard locally — before judges sitting "at nisi prius" in the county — rather than requiring the parties to travel to Westminster or another central court. It originated as a form of continuance, deferring the case "unless before" (nisi prius) the appointed term a judge of assize came to the county in question.
The clause was a formal mechanism within the English common law system of circuit justice. Once entered on the record, it transferred the trial function to the nisi prius court in the relevant county while the central court retained jurisdiction over post-trial proceedings such as motions for new trial and the entry of final judgment.
Common Confusion
The nisi prius clause is easily conflated with the broader concept of nisi prius courts themselves, but the two are distinct. The clause is the specific written entry on the record that triggered and authorized local trial proceedings; nisi prius as an institution refers to the entire system of circuit courts and assize judges empowered to try civil causes in the counties. A researcher encountering "nisi prius" in historical records must determine whether the source refers to the procedural clause, the court system, or the trial itself — all three uses appear in period sources and are often used interchangeably in ways that obscure their technical distinctions.
Why It Matters in Research
The nisi prius clause appears primarily in English common law records from the medieval period through the nineteenth century and in early American practice that tracked English procedure closely. Researchers working in pre-codification American sources — particularly before the Field Code reforms of 1848 and the procedural reforms that followed in other states — may encounter the clause in circuit court records, writs, and treatise discussions of trial practice.
Several traps await the historical researcher. First, because the clause originated as a fiction of continuance, it appears in records as a formal recitation rather than substantive pleading, and its presence does not itself reveal anything about the merits of the dispute. Second, the clause's form varied in English and American practice, and some American jurisdictions adapted or abandoned the formality while retaining the underlying mechanism of authorizing local trial. Third, as American courts moved away from the forms of common law pleading, references to the nisi prius clause become rarer after the mid-nineteenth century, but the concept of designating a county or venue for trial persisted in transformed statutory forms.
Corpus researchers should also note the relationship between the nisi prius clause and venue doctrine. The clause was not a venue selection device in the modern sense — venue was typically fixed by the nature of the action — but it is the procedural vehicle that connected the central court record to the local trial, and it therefore appears in discussions of both venue and trial procedure in historical sources.
Historical Dictionary Support
Black's Law Dictionary defines the nisi prius clause concisely as a clause "entered on the record in an action at law, authorizing the trial of the cause at nisi prius in the particular county designated," noting that "it was first used by way of continuance." This is the most complete definition available in the standard dictionaries on the Law Mind shelf, and it accurately captures both the function and the origin of the form.
What Black's does not address — and what researchers should supplement from treatise sources — is the procedural sequence in which the clause appeared. English practice manuals, including Tidd's Practice and Blackstone's Commentaries, provide fuller context: the clause was entered after issue was joined in the central court, and it provided the authority under which the sheriff summoned a jury and the assize judges conducted the trial. American practice treatises of the early nineteenth century, including Swift's System of the Laws of Connecticut, illustrate how individual states adapted or modified the form.
Historical dictionaries are largely silent on the evolution of the clause across American jurisdictions, and none catalogues the point at which specific states formally discontinued the requirement. This is a gap that corpus research in state court records and bar journals may help fill.
Jurisdictional Note
The nisi prius clause was a feature of English common law practice and carried over into American jurisdictions that adopted common law pleading. Its relevance is effectively historical in all American jurisdictions following procedural code reforms, though the term "nisi prius" survives in some American states as informal shorthand for any trial court of general jurisdiction, distinct from the appellate level.