Definition
Joinder is the procedural act of combining parties, claims, or legal steps into a single action. It operates on two principal axes:
1. Joinder of parties: The inclusion of two or more plaintiffs or defendants in a single suit. May be permissive (allowed but not required) or compulsory (required to avoid prejudice or piecemeal litigation).
2. Joinder of claims: The assertion of two or more causes of action in a single proceeding by or against the same parties. At common law this was tightly constrained by the forms of action; modern procedural rules substantially expand what may be joined.
3. Joinder in demurrer: A historical pleading device by which a plaintiff, faced with a defendant's demurrer (a challenge that the pleading is legally insufficient), formally accepted the issue of law tendered and submitted it for the court's resolution. This was the plaintiff's required response signaling readiness to argue the point of law, not an agreement with the demurrer's merits.
4. Joinder of issue: More broadly, the point in pleading at which both parties have defined the disputed question — factual or legal — and submitted it for decision.
Common Language
Modern common usage (Wiktionary): "The joining of a litigant to a suit; the act of joining; a putting together; conjunction."
Historical common usage (Webster's 1913): "The act of joining; a putting together; conjunction. Confirmed by mutual joinder of your hands." Also: "A joining of parties as plaintiffs or defendants in a suit; acceptance of an issue tendered in law or fact; a joining of causes of action or defense in civil suits or criminal prosecutions."
Ordinary usage captures the general sense of coupling or uniting, and Webster's 1913 already reflects strong legal influence. The meaningful gap is structural: in common speech, "joining" is a voluntary act. In law, joinder is frequently mandatory — a party who fails to join a required party may face dismissal, preclusion, or loss of rights. The compulsory dimension is invisible in general usage.
Common Confusion
Joinder of parties and joinder of claims are distinct operations governed by different rules. A researcher conflating the two may misread historical pleading records: a joinder challenge in an older source often concerns the form of action and whether counts belong together, not anything about whether the right parties are present. Similarly, joinder in demurrer is frequently encountered in pre-code common law materials and has no modern procedural equivalent; it should not be read as a concession or agreement but as a formal acceptance of a tendered legal issue.
Core Elements
For joinder of claims to be proper at common law, the following conditions applied:
— The form of action had to be consistent across counts (the same plea had to be available to each, and the same judgment capable of being rendered on all).
— Counts of the same nature could be joined even if the remedy differed slightly, provided uniform judgment remained possible.
— Mixed actions (combining real and personal relief) rarely permitted joinder; personal actions were the primary site of joinder practice.
Modern rules (typified by the Federal Rules of Civil Procedure) replace this form-based analysis with a transaction-or-occurrence test: claims arising from the same transaction or series of transactions, or sharing a common question of law or fact, may generally be joined.
Recognized Forms
/SUBTYPES
Permissive joinder: Parties or claims that may be joined but need not be.
Compulsory joinder: Parties whose absence would leave the action incomplete or prejudice existing parties; failure to join may be fatal to the suit.
Joinder of issue: The procedural moment at which the pleadings close and the disputed question is fixed for trial or argument.
Joinder in demurrer: Historical; plaintiff's formal acceptance of a defendant's demurrer, submitting the legal question to the court.
Misjoinder: The improper joining of parties or claims that do not meet the applicable standard; the remedy is severance, not necessarily dismissal.
Nonjoinder: Failure to include a required or necessary party.
Why It Matters in Research
Joinder is one of the most procedurally volatile terms in the corpus. Its meaning in a pre-code common law source — governed by rigid forms of action — is structurally different from its meaning in a post-Field Code or post-FRCP source, even when the same word is used. A treatise from 1850 discussing improper joinder is analyzing whether counts belong to compatible action-forms; a 1960 source using the same phrase is asking about transactional relatedness. These are different legal questions dressed in identical vocabulary.
Several research traps follow:
First, joinder in demurrer appears frequently in 18th and 19th century pleading records and reporters. Researchers unfamiliar with common law pleading sequence may misread it as a substantive concession. It is not; it is a required formal step.
Second, the distinction between permissive and compulsory joinder matters enormously for understanding whether a historical case outcome was on the merits or procedural. Many 19th century dismissals traceable to joinder problems would not have failed under modern rules — and vice versa.
Third, joinder of parties in multi-defendant criminal cases raises different considerations than in civil suits. Anderson's Dictionary flags that each count in an indictment functions as a separate indictment; the joinder analysis in criminal contexts therefore operates count-by-count, not case-by-case.
Fourth, partnership litigation produces recurring joinder questions in the corpus. At common law, partners could not sue or be sued under a firm name; individual names had to be pleaded, and questions arose constantly about who must join as plaintiff or be joined as defendant. Bouvier traces this in detail, and researchers encountering partnership disputes in historical sources should expect joinder to be litigated as a threshold matter.
Historical Dictionary Support
The historical dictionaries converge on the basic definition — joining parties or claims — but diverge in analytical depth. Black's (both editions) is definitional only, identifying the core categories without explaining the common law constraints that made joinder a substantive battleground. Bouvier provides the most technically useful historical account, explaining that at common law joinder of actions required consistent plea-forms and consistent available judgments across counts, and noting that statutes in many states had already expanded this before the Field Code reforms. Anderson supplements with the criminal side, making explicit that each indictment count is effectively a separate charge for joinder purposes. Rapalje & Lawrence addresses party structure in proceedings but does not treat joinder as an independent entry, making it less useful as a standalone source on this term.
What the historical dictionaries largely miss is the transition story: the abolition of the forms of action and the adoption of code pleading fundamentally transformed joinder from a doctrine about action-form compatibility into a doctrine about factual and legal relationship. Researchers using only historical dictionaries will understand what joinder meant before that transformation but will need modern procedural sources to understand the post-code framework.
Jurisdictional Note
Federal practice under the FRCP separates permissive joinder (Rule 20), compulsory joinder of required parties (Rule 19), and claim joinder (Rule 18). State practice varies: some states track the federal model closely; others retain modified code-pleading frameworks with different joinder thresholds. Historical state-court sources may reflect pre-code common law constraints, early Field Code adoptions, or any intermediate stage. Researchers should establish the procedural era and jurisdiction before applying a joinder analysis drawn from another source.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Civil Procedure — Parties and Claims; Pleading History — Common Law Forms of Action; Criminal Procedure — Indictment and Charging.