Definition
A provisional injunction is a court order restraining a party from taking or continuing a specified action, issued on a temporary basis before the merits of the underlying dispute are fully litigated. The order is designed to preserve the status quo and prevent irreparable harm during the pendency of litigation. It is provisional in the strict sense: it binds the parties only until the court issues a further order, whether a permanent injunction following final judgment or a dissolution of the temporary relief.
The term is occasionally used interchangeably with temporary restraining order (TRO) or preliminary injunction, but it carries no fixed procedural identity in modern American practice. Most courts and practitioners do not use "provisional injunction" as a term of art; the operative vocabulary is TRO and preliminary injunction, both governed by Federal Rule of Civil Procedure 65 in federal court and analogous state rules.
Common Confusion
Provisional injunction, temporary restraining order, and preliminary injunction are frequently used as synonyms, but they are not the same. A TRO is the most immediate form of relief, often granted ex parte and typically lasting only days. A preliminary injunction is issued after notice and an opportunity to be heard, and it may remain in effect throughout the litigation. "Provisional injunction" is an umbrella label — historically used and still appearing in older cases and treatises — that can refer to either, but more often maps to the preliminary injunction when used with any precision. Researchers encountering "provisional injunction" in source material should confirm which procedural posture the court actually addressed.
Core Elements
When courts evaluate any provisional injunctive relief — whether labeled provisional, temporary, or preliminary — the standard test examines four factors:
1. Likelihood of success on the merits: The moving party must show a reasonable probability of prevailing at trial, not certainty.
2. Irreparable harm: The threatened injury must be one that money damages cannot adequately remedy and that is imminent rather than speculative.
3. Balance of equities: The court weighs the hardship to the moving party if relief is denied against the hardship to the opposing party if relief is granted.
4. Public interest: Relief should not disserve the public, a factor that carries variable weight depending on the subject matter.
The bond requirement is a fifth practical element: under Rule 65(c), a court granting a TRO or preliminary injunction must ordinarily require the movant to post security for costs and damages the opposing party may sustain if wrongfully enjoined.
Why It Matters in Research
The label matters because it signals the era and jurisdiction of a source. "Provisional injunction" is the preferred term in nineteenth and early twentieth century American and English equity practice. Researchers reading cases or treatises from that period should treat it as functionally equivalent to a preliminary injunction in most contexts — the procedural structure was similar even if the vocabulary differed. In modern sources, the term appears rarely, and when it does, it usually reflects either loose usage or a deliberate invocation of the older equitable tradition.
Corpus researchers should watch for a related trap: some states, particularly those that codified equity practice into civil procedure codes during the late nineteenth century, used "provisional injunction" as a statutory term with a defined scope that did not perfectly match the common law preliminary injunction. California's early Field Code practice is one example. Do not assume that a "provisional injunction" in an 1880s California case has the same procedural meaning as a "provisional injunction" in an 1880s federal equity case.
The bond requirement (remedies_27) is a recurring research node. Historical sources on provisional injunctions often address the undertaking or recognizance required as security — the vocabulary shifts across eras, but the underlying obligation does not disappear. Modern Rule 65(c) is the current analogue.
Historical Dictionary Support
Bouvier's Law Dictionary flags the term directly and critically: a provisional injunction is "sometimes, though not correctly, used for interlocutory injunction." This is precisely the right note of caution. Bouvier signals that even in his era the term was imprecise — used loosely when the speaker meant an interlocutory (preliminary) injunction, which was itself a term of art distinct from a perpetual injunction granted after final hearing. The editorial correction embedded in Bouvier's definition is useful for corpus research: it confirms that terminological slippage in historical sources is not a modern problem but was recognized as a problem at the time of original publication.
What Bouvier and other nineteenth-century dictionaries do not address is the modern four-factor test, which developed through twentieth-century federal equity practice and was consolidated in decisions applying Rule 65. Historical sources frame provisional relief primarily around the equity court's jurisdiction to act pendente lite and the sufficiency of the applicant's showing — the underlying logic is continuous even where the formal vocabulary is not.
Jurisdictional Note
Federal courts use "temporary restraining order" and "preliminary injunction" as the operative terms under Rule 65. State courts vary: some use "preliminary injunction," others retain older statutory labels. A handful of states still have procedural rules that reference "temporary injunction" as the analog to what federal courts call a preliminary injunction. Researchers working across jurisdictions should not assume terminological equivalence without checking the governing procedural rules.
Encyclopedia Cross-Reference
remedies_72: Provisional Remedies — Attachment, Garnishment, Receivership, and Lis Pendens (The Law Mind Remedies & Equity Encyclopedia) — for the broader category of provisional relief and how injunctions fit within it.
remedies_27: Injunction Bonds — Rule 65(c), Amount, and Wrongful Injunction Damages (The Law Mind Remedies & Equity Encyclopedia) — for the security requirement and damages exposure when provisional relief is improperly granted.
contracts_90: Remedies — Injunctive Relief in Contract Disputes (The Law Mind Contracts & Commercial Law Encyclopedia) — for provisional injunctions in the contract context, where irreparable harm and adequacy of damages are contested most frequently.