Definition
Introductory, preparatory, or antecedent to the main matter; not final. As a standalone adjective in law, PRELIMINARY signals that a proceeding, order, finding, or instrument is provisional or threshold in nature — it precedes, and is subordinate to, a final determination. The term carries no independent legal weight by itself; its significance depends entirely on the noun it modifies.
In practice, PRELIMINARY appears most often in three distinct legal contexts:
1. Procedure — Criminal: A preliminary hearing (also called a preliminary examination) is a pretrial proceeding at which a magistrate or judge determines whether sufficient evidence exists to require a defendant to stand trial. The finding is not a determination of guilt; it is a threshold gatekeeping function.
2. Procedure — Civil: A preliminary injunction is provisional equitable relief granted before final judgment to preserve the status quo or prevent irreparable harm during litigation. It is temporary by design and does not resolve the underlying merits.
3. Contract Formation: Preliminary negotiations, letters of intent, and memoranda of understanding are communications or instruments that precede a binding contract. Whether such instruments are themselves binding is a recurring question of contract law.
Common Language
Modern common usage (Wiktionary): In preparation for the main matter; initial, introductory, preparatory.
Historical common usage (Webster's 1913): Introductory; previous; preceding the main discourse or business; prefatory — as in preliminary observations, preliminary articles, preliminary measures.
The common and legal meanings are closely aligned in general character, but the legal use carries a functional consequence the common meaning lacks. In law, describing something as "preliminary" is not merely descriptive — it has operative force. A preliminary injunction imposes legally binding obligations. A preliminary hearing triggers specific constitutional and procedural protections. A preliminary finding can determine whether a case proceeds at all. The word does not merely locate something in a sequence; it defines the legal weight, finality, and reviewability of what it modifies.
Common Confusion
PRELIMINARY vs. TEMPORARY vs. INTERLOCUTORY: These terms are related but not synonymous. Temporary (as in a temporary restraining order) suggests even shorter duration and typically involves less procedural formality than preliminary. Interlocutory refers broadly to any ruling issued during the course of litigation that does not resolve the case finally — preliminary orders are a subset of interlocutory action, but not all interlocutory orders are "preliminary" in character. Researchers using historical sources should be alert to inconsistent usage, particularly in older equity practice where "preliminary" and "interlocutory" were sometimes used interchangeably.
PRELIMINARY vs. PROVISIONAL: In some contexts — particularly civil procedure and international law — preliminary and provisional are near-synonyms. In others, they are distinct: provisional remedies in civil practice (attachment, receivership) are a formally recognized category that does not always map onto the "preliminary" label.
Why It Matters in Research
Because PRELIMINARY is an adjective rather than a standalone doctrine, searching for it in primary or secondary sources requires pairing it with the appropriate noun. A search for "preliminary" alone will surface an unmanageable range of unrelated material across criminal, civil, and contract law. The researcher's first task is to identify which preliminary context is at issue.
In criminal law materials, terminology shifted across periods and jurisdictions. Older sources may use "preliminary examination" where modern sources use "preliminary hearing," and the procedural content of those proceedings varied substantially before constitutional standards were federalized. The Law Mind Criminal Law Encyclopedia entry on Preliminary Hearing and Bindover addresses this evolution directly.
In contract law, the question of when preliminary communications ripen into binding obligations is doctrinally contested and fact-intensive. Historical sources are of limited help here because the modern treatment of letters of intent and memoranda of understanding as a recognized analytical category is largely a twentieth-century development. Bouvier's definition — framing preliminaries as "the first sketch of a treaty" that serves as a "basis" for a final instrument — captures the older intuition but does not address the enforceability questions that dominate contemporary analysis.
In equity practice, the preliminary injunction standard has evolved significantly. Researchers working in federal materials should be aware that the governing multi-factor test has been refined through case law, and historical equity treatises may describe a different standard. The Law Mind Civil Procedure & Evidence Encyclopedia entry on Preliminary Injunctions covers the current federal framework.
Admiralty researchers should note the Black's 2nd Edition entry for "preliminary act" — a procedural document required in English admiralty collision cases. This usage is specialized and narrow; it does not carry over into American practice in the same form but may appear in historical admiralty materials.
Historical Dictionary Support
The historical dictionaries agree on the core meaning: introductory, provisional, preceding the main matter. Black's (both editions) defines the term identically and proceeds directly to examples — preliminary examination, injunction, articles of peace — reflecting the predominant procedural contexts of the era. Bouvier's is the most substantive, grounding the concept in the law of treaties and framing preliminaries as instruments that contain the essential terms on which parties intend to build. This treaty-based framing is historically important but has limited application to modern domestic contract law.
Anderson's entry is a cross-reference only, directing readers to injunction, articles of peace, and proof — a signal that the term was understood primarily through its procedural applications rather than as a concept warranting independent treatment.
The Rapalje & Lawrence excerpt, though partially excerpted here in the context of pre-emption under English land legislation, illustrates how "preliminary" as a modifier appeared across diverse bodies of law, including statutory schemes governing compulsory purchase.
None of the historical dictionaries engage with what is now a central research problem: the legal enforceability of preliminary instruments in contract formation. That question was not systematically theorized in the era these dictionaries represent.
Jurisdictional Note
The procedural content of preliminary hearings varies by jurisdiction. Federal practice and state practice differ, and state rules vary further among themselves — particularly regarding the right to a preliminary hearing, the scope of cross-examination permitted, and the standard for bindover. Researchers should not assume that historical federal or common-law descriptions of "preliminary examination" map directly onto the practice of a specific state court.