Definition
Constitution has two distinct meanings in legal usage, one dominant in modern practice and one largely obsolete.
1. FUNDAMENTAL LAW OF A STATE OR NATION (primary modern meaning): A constitution is the organic and foundational law of a nation or state — written or unwritten — that establishes the character and structure of its government, lays the basic principles to which its internal life must conform, organizes the branches or departments of government, and regulates, distributes, and limits the functions of each. It is supreme law in the sense that ordinary legislation inconsistent with it is void. A written constitution is a formal document adopted by sovereign authority; an unwritten constitution, as in England, is an accumulation of statutes, customs, judicial decisions, and conventions carrying equivalent foundational force.
2. ECCLESIASTICAL AND ADMINISTRATIVE DECREE (historical and specialized meaning): In older legal usage, particularly on the European continent and in ecclesiastical law, a constitution could mean any authoritative decree, ordinance, or enactment issued by a sovereign, emperor, or religious authority. Apostolic constitutions and papal constitutions fall within this sense.
3. CERTIFICATE OF RECORD (English exchequer usage, now obsolete): In older English practice, a constitution was a certificate issued by the clerk of the pipe or auditors of the exchequer, at the request of a party intending to plead or move in court, certifying what appeared on the record regarding a matter in question. This usage is entirely obsolete and confined to historical sources.
Common Language
Modern common usage (Wiktionary): The formal or informal system of primary principles and laws that regulates a government or other institutions; a legal document describing such a system; also, the act or process of establishing something, or the composition and structure of a thing.
Historical common usage (Webster's 1913): The act or process of constituting; enactment; establishment; formation; also the state of being, the structure and connection of parts which constitutes and characterizes a system or body; natural condition; texture.
Webster's 1913 reflects a broader, more physical sense — one's bodily "constitution," the "constitution" of a substance — that sits alongside the governmental meaning. The legal term operates exclusively in the governmental and institutional register. Researchers should note that historical legal sources sometimes use "constitution" in the sense of any authoritative enactment or establishment (meaning 2 above), not only the foundational-law sense that dominates modern usage.
Common Confusion
CONSTITUTION VS. CONSTITUTIONALISM VS. ORGANIC LAW
A constitution is the document or body of principles itself. Constitutionalism is the broader theory that government authority must be derived from and limited by such a foundation. Organic law is a near-synonym for constitution in the foundational-law sense but sometimes refers more narrowly to a statute organizing a territory or body. In historical sources, "organic law" and "fundamental law" are used interchangeably with constitution; researchers should not treat them as technically distinct unless context signals otherwise.
Core Elements
For a constitution in the primary sense, legal sources and doctrine converge on several defining characteristics:
Supremacy: A constitution operates as the supreme law within its jurisdiction. Ordinary legislation inconsistent with it is without legal force.
Foundational scope: It organizes government at the structural level — establishing branches, conferring powers, and distributing authority — rather than regulating particular conduct as ordinary statutes do.
Limitation of power: A defining function of constitutional law, particularly in the American tradition, is not merely to grant governmental power but to limit it. Rights provisions, separation of powers, and federalism structures all serve this limiting function.
Written or unwritten character: The written/unwritten distinction is real but should not be overdrawn. Unwritten constitutions (the English model) carry equivalent authority through different mechanisms — long-settled custom, judicial interpretation, and statutory accretion. Most modern constitutions are written.
Entrenchment: Constitutional provisions are typically harder to change than ordinary law, requiring supermajority votes, ratification processes, or other special procedures. This distinguishes constitutional from statutory norms.
Recognized Forms
/SUBTYPES
Written constitution: A single enacted document, or a small set of canonical documents, serving as the formal supreme law. The United States Constitution is the paradigm example.
Unwritten (or uncodified) constitution: A constitution consisting of statutes, judicial decisions, conventions, and customs with no single canonical text. The United Kingdom is the primary example in Anglo-American legal tradition.
Federal constitution: Divides sovereign authority between a national government and constituent states or provinces, with the constitution itself defining the boundary.
Rigid vs. flexible constitution: A rigid constitution requires special procedures to amend; a flexible constitution may be amended by ordinary legislative process. Written constitutions tend toward rigidity; unwritten constitutions toward flexibility.
Ecclesiastical constitution: A document issued by papal or other religious authority establishing church law or doctrine. This sense appears in historical sources and canon law.
Why It Matters in Research
Researchers using historical legal sources face three distinct navigational challenges with this term.
First, the obsolete exchequer certificate meaning appears in Bouvier without clear flagging that it is entirely separate from the governmental meaning. A reader scanning Bouvier's entry for foundational-law doctrine will encounter a definition about the clerk of the pipe and may misread it as a general definition rather than a specialized English procedural usage. The two Bouvier entries are entirely disconnected legal concepts sharing only a word.
Second, historical sources — particularly those drawing on continental European or ecclesiastical tradition — use "constitution" to mean any authoritative decree or enactment. Burrill's entry references Blackstone and notes an "established form of government" but also cross-references the appointing or establishing sense (constituere, constitutio). In older English and European legal writing, a monarch's constitution was simply a royal ordinance. This decree-meaning is alive in ecclesiastical contexts (papal constitutions remain current documents) and in some civil law jurisdictions' usage. Researchers reading pre-nineteenth-century European materials should treat "constitution" as potentially meaning any formal enactment, not necessarily a supreme fundamental law.
Third, the written/unwritten distinction has practical consequences for corpus research. American sources from the Founding period through the twentieth century typically assume a written constitution and build doctrine accordingly (judicial review, enumeration, textual interpretation). English and Commonwealth sources assume an unwritten constitution and develop different analytical frameworks. Cross-jurisdictional research requires constant attention to which model is operative.
The Anderson's Dictionary entry in the source material is a mis-match — it concerns conspiracy, not constitution — and should be disregarded for this entry. This is the kind of indexing artifact that appears occasionally in historical compiled sources.
Historical Dictionary Support
The five historical sources substantially agree on the primary meaning. Black's (1st and 2nd editions) offer the most complete formulation: the organic and fundamental law of a nation or state, written or unwritten, establishing the character and conception of government, laying basic principles, organizing government, and regulating, distributing, and limiting the functions of different departments. The language is nearly identical across both Black's editions, indicating this as settled doctrine by the late nineteenth century.
Bouvier presents two entirely separate entries. The first — the exchequer certificate — is the older English procedural sense. The second provides the governmental definition: "the fundamental law of a state, directing the principles upon which the government is founded, and regulating the exercise of the sovereign powers." Bouvier also notes the continental European usage: "Constitution, in the former law of the European continent, signified as much as decree." This is one of the few historical sources that explicitly flags the decree-meaning alongside the foundational-law meaning, making it particularly valuable for researchers working across legal traditions.
Burrill's entry is the most etymologically grounded, leading with the Latin constitutio and tracing meaning through "establishment" and "appointment" before arriving at "an established form of government" with citations to Blackstone (1 Bl. Com. 50) and Stephen (1 Steph. Com. 32). Burrill also includes what appears to be a fragment of the appointing-an-attorney usage (attorning and substituting), which reflects the broader Latin sense of constituting or appointing a person to a legal role. This usage has no significant modern legal presence.
All sources treat the written/unwritten distinction as real but secondary to the underlying concept. None of the historical sources devotes significant attention to the mechanisms of constitutional enforcement — judicial review, standing doctrine, constitutional avoidance — which are creatures of case law rather than definition.
Jurisdictional Note
In the United States, "the Constitution" without qualification refers to the federal Constitution of 1787 with its amendments. Each state also has its own constitution, and state constitutional law is a distinct field. In the United Kingdom, "the constitution" refers to the unwritten constitutional order. In civil law countries with written constitutions (France, Germany, most of Latin America), constitutional structure varies significantly from the American model, and the term's use in those systems should be understood against their particular institutional frameworks.
Encyclopedia Cross-Reference
Constitutional Avoidance — The Doctrine of Avoiding Constitutional Questions (The Law Mind Constitutional Law Encyclopedia)