Definition
In law, "formal" describes something that complies with, relates to, or is governed by prescribed form, procedure, or structure — as distinguished from matters of substance, merit, or content. The term operates primarily as a modifier and carries different weight depending on context.
1. Procedural or structural compliance. A formal requirement is one that specifies how something must be done — the manner, mode, or outward expression of a legal act — rather than what must be done or why. A will that lacks required witness signatures fails a formal requirement. A contract executed under seal satisfies a formal one.
2. Official or ceremonial character. A formal proceeding, hearing, or rulemaking is one conducted according to established, often mandatory, procedural rules — as contrasted with an informal proceeding where those rules are relaxed or inapplicable.
3. Pro forma matters. Following Black's usage, "formal" can indicate something inserted or done as a matter of established form rather than substantive necessity — a procedural placeholder that the law requires but that does not bear on the underlying merits. A formal party (as distinguished from a necessary or indispensable party) illustrates this usage.
4. Formal defects. Errors or irregularities in the form of a legal instrument or proceeding, as opposed to substantive defects going to its validity, enforceability, or legality on the merits.
Common Language
Modern common usage (Wiktionary): In accordance with established forms; official; proper and not casual; ceremonial; organized and well-structured.
Historical common usage (Webster's 1913): Belonging to the form, shape, or external appearance of a thing; having the power of making a thing what it is; constituent; essential.
The gap matters. In ordinary English, "formal" often implies seriousness, officialness, or ceremonial observance — a formal dinner, a formal complaint. In legal usage, the formal/substantive distinction cuts differently: a defect can be formal without being trivial, and a formal requirement can be strictly mandatory even when its underlying purpose is purely procedural. Conversely, some legal contexts treat formal defects as curable or excusable, precisely because they do not implicate the substance of the matter. Webster's philosophical sense — formal as constitutive or essential — is almost the inverse of how lawyers use the term, where "formal" is regularly contrasted with the essential or substantive.
Common Confusion
Formal vs. substantive. This is the operative distinction underlying nearly all legal uses of the term. A formal requirement governs how an act is performed; a substantive requirement governs whether the act is legally valid or the right exists at all. The confusion matters because different legal consequences often attach: formal defects may be waived, cured, or excused; substantive defects may be fatal. Courts and statutes do not always use these terms consistently, and what one jurisdiction treats as a formal defect another may treat as substantive.
Formal vs. informal proceedings. In administrative law, "formal" specifically refers to on-the-record proceedings governed by the trial-type procedures of APA Sections 556–557. "Informal" rulemaking (notice-and-comment under Section 553) is a term of art that does not mean unstructured or casual — informal here means the full formal-hearing apparatus does not apply. Researchers who import ordinary-language intuitions about "informal" being less rigorous can misread the administrative record.
Why It Matters in Research
The word "formal" is one of the most context-dependent adjectives in legal sources. Its meaning shifts depending on the field — what formal means in administrative rulemaking is not what it means in probate, contract execution, or civil procedure. Researchers should treat every appearance of "formal" as requiring field-specific disambiguation.
In historical sources, the term frequently appears without explanation in phrases like "formal defects," "formal parties," or "formal requisites," assuming the reader understands the operative distinction in context. Black's 2nd edition entry is thin — it signals the form/substance divide and the pro forma usage but leaves most of the analytical work to the reader.
In the probate and estates context, the formal/informal distinction structures entire procedural regimes (formal vs. informal probate administration), and the same will may face different scrutiny depending on which proceeding is used. Execution formalities for wills — witness requirements, signature placement, attestation — are textbook "formal" requirements, and their historical evolution is a significant research thread in its own right.
In administrative law, the formal/informal rulemaking distinction is fundamental and has its own substantial case law. Confusion between the two is a common research error when working with agency materials that use "formal" loosely.
In contract and commercial law, formal contracts (historically, those under seal) were distinguished from simple or parol contracts. The seal's legal significance has largely eroded in American law, but historical sources treat this distinction extensively, and researchers working with pre-twentieth-century materials need to understand the older framework.
Jurisdictional variation in what counts as a "formal" vs. "substantive" defect — particularly in probate, domestic relations, and administrative practice — means that general statements in secondary sources may not hold for a specific jurisdiction.
Historical Dictionary Support
Black's 2nd edition entry is brief to the point of being a pointer rather than a definition: "relating to matters of form; as, 'formal defects;' inserted, added, or joined pro forma." The cross-reference to Parties signals the pro forma party usage but provides no analytical framework.
Historical legal dictionaries generally treat "formal" as a modifier that derives its content from the formal/substantive distinction — a distinction those dictionaries typically address more fully under entries like "substance," "defect," or specific compound terms (formal contract, formal party, formal requisite). Researchers relying on Black's 2nd edition alone will find the term underexplained; the entry presupposes familiarity with the formal/substantive divide rather than illuminating it.
What historical sources miss: the administrative law usage (formal vs. informal rulemaking) is an entirely twentieth-century development and does not appear in any pre-APA dictionary. Similarly, the structured formal/informal probate administration distinction that appears in the Uniform Probate Code postdates the older dictionaries. Researchers working with modern administrative or probate materials should not expect historical dictionary entries to map onto current usage.
Jurisdictional Note
The legal weight of formal requirements varies significantly by jurisdiction and field. In probate, some states follow UPC-based formal/informal administration distinctions; others do not. In administrative law, whether a proceeding is "formal" within the meaning of the APA turns on specific statutory triggers that courts have interpreted narrowly. Researchers should not assume that "formal" as a descriptor in one jurisdiction's statutes carries the same procedural consequences in another.
Encyclopedia Cross-Reference
Formal Rulemaking — On-the-Record Procedures under APA Sections 556–557 (The Law Mind Administrative Law & Government Encyclopedia)
Attested Wills — Formalities, Witnesses, and the Function of Execution Requirements (The Law Mind Trusts, Estates & Probate Encyclopedia)
Premarital Agreements — Formal Requirements (Writing, Disclosure, Voluntariness) (The Law Mind Family Law Encyclopedia)