Definition
A joinder in demurrer is a formal pleading by which one party accepts an issue of law tendered by the opposing party in a demurrer, signaling agreement that the matter shall be resolved on that legal question alone. In classical common law pleading, when a defendant filed a demurrer — asserting that the plaintiff's pleading was legally deficient even if its facts were assumed true — the plaintiff was required to respond by either amending the pleading or joining in the demurrer. The joinder was that response: a set-form declaration that the plaintiff accepted the legal issue as framed and submitted it to the court for decision. Together, the demurrer and the joinder in demurrer constituted and completed what was called an "issue in law."
The joinder in demurrer was not a substantive argument. It carried no independent legal content. Its function was procedural and formal — closing the pleadings, fixing the issue, and authorizing the court to proceed to judgment on the point of law raised.
Common Confusion
Joinder in demurrer is sometimes conflated with a general joinder of issue, which closes pleadings on a question of fact rather than law. The distinction matters historically: an issue in law (completed by joinder in demurrer) goes to the court; an issue in fact goes to a jury. Researchers encountering either term in older records should confirm which type of issue was being joined before drawing conclusions about how the dispute was resolved.
The term is also superficially similar to "joinder" in its modern procedural senses — joining parties or claims under rules like Federal Rule of Civil Procedure 18-20 — but those modern usages share only the word. Joinder in demurrer belongs entirely to the classical pleading system and has no functional equivalent in modern civil procedure.
Why It Matters in Research
This term is a marker of the formal common law pleading system that governed English and American courts before procedural reform. In England, the system was largely displaced by the Common Law Procedure Act 1852 and subsequent reforms. In the United States, the Field Code (New York, 1848) and its successors abolished the forms of common law pleading in most states, and the Federal Rules of Civil Procedure (1938) completed the transformation at the federal level. Any document containing a joinder in demurrer therefore dates — or applies — to the pre-code era.
Researchers working in colonial records, early American court files, or English Year Books and reports through the mid-nineteenth century will encounter this term in actual pleading documents. Its presence signals that the case was resolved on a pure question of law without going to a jury on the facts, which has implications for how the record should be read and what kinds of precedent the resulting decision established.
One practical trap: in jurisdictions that were slow to adopt code pleading, or that retained equity practice alongside law, the formal vocabulary of demurrer and joinder persisted well past the nominal reform dates. A researcher should not assume the term disappears from records the moment a reform statute passed.
Historical Dictionary Support
Black's and Burrill's agree on the core mechanics. Both describe the joinder in demurrer as the formal acceptance by one party of the legal issue tendered by the other, with Burrill adding the important structural point — drawn from Stephen's Pleading — that the demurrer and the joinder together constitute and complete the issue in law. Black's frames the sequence from the plaintiff's perspective (the plaintiff accepts the defendant's tender), which reflects the most common procedural posture but is not the only one; a plaintiff could also demur to a defendant's pleading, in which case the defendant would join.
Neither dictionary fully contextualizes the term within the broader pleading sequence or explains how its abolition under code pleading affected practice. Burrill's cross-references to Demurrer and Issue in Law are the more useful pointers for researchers needing to reconstruct the procedural framework. Stephen's Pleading (Principles of Pleading and Practice) remains the foundational treatise source for understanding how joinder in demurrer functioned within the system as a whole.
Jurisdictional Note
Joinder in demurrer is a term of the English common law pleading system and traveled with that system to American jurisdictions. Its practical use ended at different times depending on when individual states adopted code or rules-based pleading. A handful of states retained common law pleading forms well into the twentieth century. Researchers working in Louisiana, which followed a civil law tradition, will not encounter the term in the same context.