A constitution is the body of fundamental principles and rules that organizes a political community, particularly a state. It establishes the institutions of government, allocates public powers, and commonly defines rights and procedures for changing the constitutional order. Most contemporary constitutions have a higher status than ordinary law, although their form, enforceability, and amendment requirements vary. A constitution may be consolidated in a principal document or distributed among several legal sources and established practices. (idea.int)
Meaning and legal status
In a broad descriptive sense, a constitution comprises the basic arrangements through which political authority is exercised. In a narrower legal sense, it is an authoritative instrument establishing institutions and binding rules. Constitutional law concerns these rules and their interpretation. Constitutional provisions commonly address the source of sovereignty, the composition of public bodies, relations between government and individuals, and the procedures through which binding decisions are made. (idea.int)
A constitution must be distinguished from constitutionalism: the principle that public power is effectively limited by fundamental rules. The existence of a constitutional document does not by itself establish democracy or guarantee the rule of law. Constitutional texts and actual governing practices may diverge; effective limits depend on institutions and political conduct as well as formal provisions. (idea.int)
Codified and uncodified constitutions
A codified constitution brings fundamental rules together in a principal authoritative text. Nevertheless, its operation also depends on implementing laws, judicial decisions, and political practices. The United States Constitution, signed on September 17, 1787, is an influential example: it established a new national governmental framework and provided procedures for ratification and amendment. (idea.int)
An uncodified constitution is not collected in a single comprehensive constitutional instrument. The United Kingdom’s constitution draws on statutes, common law, judicial decisions, treaties, and constitutional conventions. Calling it “unwritten” is misleading because many of its sources are written. Conventions are established political rules or understandings whose authority differs from that of legally enforceable provisions. (parliament.uk)
Codification is distinct from constitutional supremacy. Under the traditional doctrine of parliamentary sovereignty in the United Kingdom, Parliament is the supreme legal authority. In many systems with entrenched constitutions, by contrast, ordinary legislation may be invalidated for inconsistency with higher constitutional law. (commonslibrary.parliament.uk)
Institutions and distribution of power
Constitutions identify the principal organs of government and regulate their selection, powers, tenure, and accountability. They commonly establish a legislature to enact laws, an executive to administer government, and a judiciary to resolve legal disputes. Separation of powers distributes functions among institutions, while mechanisms such as vetoes, legislative scrutiny, and judicial oversight regulate their interaction. The degree of institutional separation varies across constitutional systems. (idea.int)
Territorial arrangements are another central subject. Federalism constitutionally divides authority between a central government and constituent units. A unitary state instead organizes authority within a single overarching state structure, although it may grant extensive powers to regional or local bodies. Constitutions can specify legislative competences, financial relationships, and mechanisms for resolving disputes between levels of government. (idea.int)
Rights and constitutional enforcement
Many constitutions protect human rights, including equality, freedom of expression, religious liberty, and safeguards in legal proceedings. Some also recognize social and economic rights, including rights relating to education. Rights provisions differ in their beneficiaries, permitted limitations, and available enforcement mechanisms; their inclusion does not necessarily make every claim directly enforceable in court. (idea.int)
Judicial review allows courts to assess whether legislation or official action complies with constitutional requirements. Some systems concentrate constitutional review in a specialized constitutional court; others distribute it among ordinary courts. Review may occur before a measure takes effect or afterward, through individual litigation or proceedings initiated by designated institutions. Access rules and remedies determine how constitutional protections operate in practice. (idea.int)
Judicial enforcement also depends on arrangements for appointing judges, protecting their independence, and holding them accountable. Constitutional systems differ over which institutions may initiate review and whether courts can invalidate legislation, issue declarations, or provide other remedies. These procedural differences are important alongside the substantive wording of constitutional guarantees. (idea.int)
Constitution-making and amendment
Constitution-making establishes or replaces the fundamental framework of government. Processes may involve elected assemblies, negotiations, expert drafting, public consultation, and approval by a referendum. Public participation can occur at several stages, from identifying constitutional issues to discussing drafts and ratifying a final text. There is no single universally adopted model of participation. (idea.int)
A constitutional amendment formally changes constitutional provisions. Entrenched constitutions typically require procedures more demanding than ordinary lawmaking, such as supermajority votes, repeated parliamentary approval, constituent-unit consent, or popular ratification. These requirements seek to accommodate change while protecting fundamental rules against transient or narrowly partisan majorities. Constitutional meaning can also evolve through interpretation and conventions without formal textual amendment. (idea.int)
Some constitutions restrict amendment of particular principles. Germany’s Basic Law requires two-thirds support in both the Bundestag and Bundesrat for amendments. Article 79(3) prohibits amendments affecting the division of the federation into Länder, their basic participation in legislation, or the principles laid down in Articles 1 and 20. Such restrictions distinguish the authority to amend an existing constitutional framework from an unrestricted power to rewrite its foundations. (gesetze-im-internet.de)