Definition
An interlocutory order is a court order issued during the pendency of a case that resolves a procedural or interim matter without disposing of the litigation itself. It is distinguished from a final order or judgment, which terminates the action and determines the rights of the parties. An interlocutory order is provisional in character — it governs the case as it proceeds but remains subject to revision or reconsideration until the case concludes.
Common examples include orders granting or denying a preliminary injunction, orders compelling or quashing discovery, orders certifying a class, and orders granting a stay. In family law, interlocutory decrees of divorce or adoption occupy a distinct category: they are formally final on their own terms but become fully operative only after a waiting period or subsequent event.
The central significance of the term is procedural: because an interlocutory order is not a final judgment, it is generally not immediately appealable as of right under the final judgment rule.
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Common Language
Modern common usage (Wiktionary): "Interlocutory" in general English means occurring or taking place during a conversation or dialogue; interjected. More broadly, it can describe something interim or intermediate in a process.
Historical common usage (Webster's 1913): Webster defined "interlocutory" as "consisting of, or pertaining to, dialogue; conversational," and secondarily as "intermediate; not final or definitive; made or done during the progress of an action."
The legal meaning has almost no connection to the conversational sense. In law, the term carries precise procedural weight: it signals that an order is non-final and therefore presumptively unreviewable by appeal until the case ends. A researcher encountering the word in a general context should not carry ordinary connotations of dialogue or conversation into legal analysis.
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Common Confusion
INTERLOCUTORY ORDER vs. FINAL ORDER: The distinction is the foundation of appellate jurisdiction. A final order ends the litigation; an interlocutory order does not. Misidentifying an order as final when it is interlocutory — or vice versa — determines whether an appeal is timely and whether an appellate court has jurisdiction to hear it. Courts have generated substantial doctrine around edge cases: orders that are "final" as to one claim or one party, partial summary judgments, and orders in multi-party litigation raise difficult classification questions. The finality line is not always obvious in historical materials, where courts used the terms loosely.
INTERLOCUTORY ORDER vs. INTERLOCUTORY DECREE: In equity practice and older sources, "decree" and "order" were formally distinct. A decree resolved substantive equitable rights; an order addressed procedural matters. An interlocutory decree in chancery could finally dispose of one portion of a case while leaving others open. Modern merged procedure has largely collapsed this distinction, but researchers working in pre-merger equity materials — roughly pre-1938 in federal courts, varying by state — must attend to it.
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Why It Matters in Research
The finality rule is the primary research trap. Federal appellate jurisdiction under 28 U.S.C. § 1291 attaches only to final decisions. Whether an order qualifies as interlocutory and thus non-appealable is a threshold issue that has generated a large body of case law, much of it jurisdiction-specific and fact-sensitive. Researchers tracing appellate history must verify at each step whether the order under review was classified as interlocutory or final — the same type of order (e.g., a preliminary injunction) may have been treated differently across circuits or time periods.
Exceptions to the final judgment rule are numerous and vary by jurisdiction and statute. At the federal level, 28 U.S.C. § 1292(a) provides appeal as of right from certain interlocutory orders (including injunctions); § 1292(b) allows permissive interlocutory appeal when a district court certifies that the order involves a controlling question of law. The collateral order doctrine, developed through case law, carves out a further category. State courts have their own statutory and common-law exceptions, which differ substantially. A researcher who applies federal appellate rules to a state proceeding, or who applies modern federal rules to historical materials, risks serious error.
In family law, the interlocutory divorce decree is a specific procedural device used in some states: parties are judicially separated by interlocutory decree, with the final divorce decree issuing after a statutory waiting period. The interlocutory decree in this context creates interim rights and obligations — including property and support orders — that practitioners and researchers must track separately from the final disposition.
Historical sources through roughly the mid-twentieth century often use "interlocutory" in the context of equity practice, where the term carried distinct meaning tied to the distinction between law and equity courts. Post-merger sources reflect unified procedure, but the doctrinal foundations remain anchored in equitable origins.
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Historical Dictionary Support
Black's Law Dictionary captures the core meaning precisely: an interlocutory order "decides not the cause, but only settles some intervening matter relating to it," offering as an example an injunction granted to preserve the plaintiff's possession pending the hearing of the cause. This formulation — settling an intervening matter without deciding the cause — remains the operative definition across modern sources and case law. The chancery injunction example is instructive because it reveals the equitable lineage of the concept; interlocutory orders were instruments of equity practice before they became a general procedural category.
Burrill identifies the term as belonging to "practice" and defines it as an order made during the progress of a case, which aligns with Black's but is less elaborated. Both sources treat the non-finality as the defining characteristic, and neither ventures into the complex appellate jurisdiction doctrine that later grew up around the term. This is expected: the final judgment rule as a rigorous federal doctrine did not crystallize until the twentieth century, and the statutory framework of 28 U.S.C. § 1292 postdates both dictionaries in their relevant editions.
Neither historical dictionary addresses the interlocutory divorce decree as a distinct recognized form, nor do they engage with the modern collateral order doctrine. Researchers relying solely on historical dictionary definitions will find the core concept accurately stated but will miss the doctrinal architecture that gives the term its practical significance.
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Jurisdictional Note
Interlocutory appeal rights vary substantially by jurisdiction. Federal courts operate under the final judgment rule with statutory and judge-made exceptions; state courts have developed independent frameworks, some more permissive and some more restrictive. Several states allow interlocutory appeals from a broader range of orders by right or by leave. Family law proceedings in some states involve formally structured interlocutory decrees (particularly in divorce) that carry no counterpart in federal practice.
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Encyclopedia Cross-Reference
The Law Mind Civil Procedure & Evidence Encyclopedia, civpro_105: Interlocutory Appeals — 28 U.S.C. 1292(a) and (b). Primary reference for federal appellate jurisdiction, the statutory exceptions to the final judgment rule, and the collateral order doctrine.
The Law Mind Family Law Encyclopedia, family_213: Appeals in Family Law Cases (Interlocutory and Final). Essential for researchers working with interlocutory divorce decrees, custody orders, and the distinct treatment of interlocutory rulings in domestic relations proceedings.
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