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EU Legal Terms A-D

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A

Acquis — See Acquis communautaire. The accumulated body of EU law, including treaties, legislation, case law, international agreements, and general principles that all Member States must accept and implement. Candidate countries must adopt the full acquis before accession.

Advocate General — A member of the European Court of Justice who delivers reasoned opinions on cases assigned to them. Advocate Generals assist the Court by providing independent, impartial legal analysis; their opinions are not binding but are highly influential in shaping the Court’s judgments.

Glossary of EU Legal Terms (A-Z)

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This glossary defines key legal terms and concepts in European Union law, providing concise explanations for students, practitioners, and anyone seeking to understand the EU legal system.

A

Acquis Communautaire. The entire body of EU law, rights, and obligations binding all Member States. It includes treaties, legislation, case law, international agreements, and general principles. Candidate countries must accept the full acquis before accession.

Advocate General. A member of the European Court of Justice who delivers impartial opinions on cases. Advocates General assist the Court by providing independent legal analysis, though their opinions are not binding on the Court.

The Doctrine of Supremacy of EU Law

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The doctrine of supremacy (also referred to as primacy) of EU law is a foundational principle of European Union law. It establishes that EU law takes precedence over the national laws of Member States, including their constitutions. The principle is not explicitly stated in the founding treaties but was developed by the European Court of Justice as an inherent requirement of the EU legal order. Supremacy ensures that EU law is applied uniformly across all Member States and cannot be unilaterally overridden by national legislative, executive, or judicial action.

The EU Treaties as Constitutional Framework: TEU and TFEU

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The Treaties of the European Union — the Treaty on European Union (TEU) and the Treaty on the Functioning of the European Union (TFEU) — constitute the constitutional foundation of the EU legal order. As amended most recently by the Treaty of Lisbon (2007, in force 2009), the Treaties establish the Union’s objectives, institutions, legal instruments, and competences, while also setting forth the fundamental values that underpin the European project. The Court of Justice has characterised the Treaties as a “constitutional charter” (Opinion 1/91), reflecting their fundamental character as the supreme source of EU law, superior to all secondary legislation and binding on all Member States and institutions.

The General Data Protection Regulation (Regulation 2016/679)

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The General Data Protection Regulation (GDPR), formally Regulation (EU) 2016/679, is the European Union’s comprehensive framework for the protection of natural persons with regard to the processing of personal data. Adopted on 27 April 2016 and applicable from 25 May 2018, it replaced the 1995 Data Protection Directive (Directive 95/46/EC). The GDPR represents the most ambitious and influential data protection regime globally, establishing a harmonised legal framework across the EU while giving individuals greater control over their personal data. Its territorial reach, enforcement powers, and substantial fines have made it the benchmark for privacy regulation worldwide.

The Preliminary Reference Procedure under Article 267 TFEU

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The preliminary reference procedure under Article 267 TFEU is the cornerstone of the European Union’s judicial architecture. It establishes a cooperative dialogue between the Court of Justice of the European Union (CJEU) and national courts, enabling national courts to seek authoritative rulings on the interpretation and validity of EU law. The procedure is the procedural mechanism that makes the doctrines of direct effect and supremacy operational, ensuring that EU law is applied uniformly across all twenty-seven Member States. It is the most important judicial procedure in EU law, with thousands of references having shaped the legal order since the Treaty of Rome.

The Treaty of Rome (1957)

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The Treaty of Rome, formally the Treaty Establishing the European Economic Community (TEEC), was signed on 25 March 1957 by Belgium, France, Italy, Luxembourg, the Netherlands, and West Germany. It entered into force on 1 January 1958 and created the European Economic Community (EEC), establishing a common market and laying the foundation for what would become the European Union. The Treaty of Rome is one of the most significant international agreements of the twentieth century.

Van Gend en Loos (1963): The Foundation of Direct Effect

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Van Gend en Loos v Nederlandse Administratie der Belastingen (Case 26/62) is the foundational judgment of European Union law. Decided by the European Court of Justice on 5 February 1963, it established the doctrine of direct effect, enabling individuals to invoke Treaty provisions before national courts. The case transformed the European Economic Community from a traditional international organization into a new legal order conferring rights on individuals. It is widely regarded as the most important judgment in the history of European integration — the EU’s Marbury v Madison.

Costa v ENEL (1964): The Supremacy of EU Law

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Costa v ENEL (Case 6/64) is the landmark judgment in which the European Court of Justice established the doctrine of supremacy of EU law over conflicting national law. Decided on 15 July 1964, one year after Van Gend en Loos, it completed the constitutional foundation of EU law by ensuring that Community law could not be unilaterally overridden by subsequent national legislation. Together with Van Gend en Loos, Costa established the twin pillars of the EU legal order: direct effect and supremacy.

Direct Effect of EU Treaties and Regulations

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The doctrine of direct effect is a fundamental principle of EU law allowing individuals to invoke EU provisions before national courts. It ensures that EU law creates not only obligations for Member States but also rights for individuals that national courts must protect. Direct effect transforms the EU legal order from an intergovernmental treaty regime into a system of individual legal empowerment, enabling citizens to enforce their EU rights without waiting for state action.

EU Legal Terms E-H

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E

European Court of Justice (ECJ) — The highest court of the European Union, formally the Court of Justice within the CJEU. It hears appeals from the General Court, delivers preliminary rulings under Article 267 TFEU, and adjudicates direct actions brought by Member States or institutions. Each Member State appoints one judge.

European Central Bank (ECB) — The EU institution responsible for monetary policy for the eurozone, established under Articles 282-284 TFEU. The ECB sets interest rates, conducts foreign exchange operations, and ensures price stability. It is independent from political influence and located in Frankfurt.

Infringement Proceedings under Articles 258–260 TFEU

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Infringement proceedings under Articles 258–260 TFEU are the primary enforcement mechanism by which the European Commission ensures that Member States comply with their obligations under EU law. The procedure enables the Commission, as guardian of the Treaties, to bring a Member State before the Court of Justice of the European Union for failure to fulfil a Treaty obligation. The system combines administrative dialogue, judicial enforcement, and financial penalties to secure compliance with EU law across all twenty-seven Member States.

The Charter of Fundamental Rights of the European Union

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The Charter of Fundamental Rights of the European Union is the primary instrument for the protection of fundamental rights within the EU legal order. Proclaimed in 2000 and given binding legal effect by the Treaty of Lisbon in 2009, the Charter consolidates the fundamental rights applicable at EU level into a single, codified document. Article 6(1) TEU provides that the Charter has the same legal value as the Treaties, making it a source of primary EU law. The Charter represents the culmination of decades of development from the CJEU’s general principles of law to a written constitutional catalogue of rights, reflecting the Union’s commitment to placing the individual at the heart of its legal order.

The Digital Services Act (Regulation 2022/2065)

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The Digital Services Act (DSA), formally Regulation (EU) 2022/2065, is the European Union’s comprehensive regulatory framework for intermediary services in the digital economy. Adopted on 19 October 2022 and applicable from 17 February 2024 for most provisions, the DSA updates and replaces the e-Commerce Directive (Directive 2000/31/EC). It establishes a tiered system of obligations for digital intermediaries, introduces robust accountability mechanisms, and creates a new enforcement architecture for the regulation of online platforms. The DSA is paired with the Digital Markets Act (Regulation 2022/1925), which addresses gatekeeper platforms in digital markets.

The Maastricht Treaty (1992)

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The Treaty on European Union, commonly known as the Maastricht Treaty, was signed on 7 February 1992 by the twelve Member States of the European Communities and entered into force on 1 November 1993. It created the European Union and fundamentally transformed the nature and scope of European integration, introducing political union alongside economic integration. The Maastricht Treaty represents the most ambitious step in European integration since the Treaty of Rome, creating a union that extended well beyond the original economic community.

EU Competition Law Framework: Articles 101–102 TFEU and Merger Control

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EU competition law is the framework of rules prohibiting anticompetitive conduct and ensuring the proper functioning of the internal market. The primary substantive provisions are Article 101 TFEU (prohibition of anticompetitive agreements), Article 102 TFEU (prohibition of abuse of a dominant position), and the EU Merger Control Regulation (Regulation 139/2004). Together with state aid rules under Articles 107–109 TFEU, these provisions form the competition pillar of the EU legal order, enforced primarily by the European Commission. EU competition law is one of the most influential competition law regimes globally, serving as a model for over 130 jurisdictions worldwide.

EU Legal Terms M-Z

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Mutual Recognition — The principle established in Cassis de Dijon (1979) requiring Member States to allow goods and services lawfully produced in another Member State to circulate freely within their territory. Exceptions are permitted only for overriding public interest requirements such as public health or consumer protection.

O

Ordinary Legislative Procedure (OLP) — The standard EU lawmaking process under Article 294 TFEU, formerly the co-decision procedure. The Commission proposes legislation, and the Parliament and Council act as co-legislators. If they disagree, a conciliation committee attempts to reach a compromise. OLP applies to most policy areas.

Internationale Handelsgesellschaft (1970): Fundamental Rights in EU Law

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Internationale Handelsgesellschaft mbH v Einfuhr- und Vorratsstelle für Getreide und Futtermittel (Case 11/70) is a seminal judgment of the European Court of Justice that established fundamental rights as general principles of EU law. Decided on 17 December 1970, the case arose from a direct challenge to the compatibility of a Community agricultural regulation with German constitutional fundamental rights. The case triggered a constitutional dialogue between the ECJ and the German Federal Constitutional Court that shaped the development of fundamental rights protection in the EU legal order.

Judicial Review of EU Acts under Article 263 TFEU

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The action for annulment under Article 263 TFEU is the principal mechanism for the judicial review of the legality of EU acts. It enables the Court of Justice of the European Union to review the lawfulness of legislative, regulatory, and administrative acts of EU institutions, bodies, offices, and agencies. The procedure is the constitutional remedy of EU law, analogous to judicial review in national legal systems, ensuring that EU institutions act within the limits of their powers and respect the rule of law.

The Principle of Conferral under Article 5 TEU

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The principle of conferral is the foundational constitutional principle defining the limits of European Union competence. Article 5(2) TEU provides that the Union shall act only within the limits of the competences conferred upon it by the Member States in the Treaties to attain the objectives set out therein. Competences not conferred upon the Union in the Treaties remain with the Member States. The principle establishes that the EU is a union of limited attributed powers, in contrast to the plenary legislative competence of sovereign states. Together with subsidiarity and proportionality, conferred power is one of the three horizontal principles governing the exercise of EU competence.

The Principle of Subsidiarity in EU Law

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The principle of subsidiarity governs the exercise of EU competences by ensuring that the Union acts only when objectives cannot be sufficiently achieved by Member States alone. It functions as a constitutional safeguard against unnecessary centralization, protecting national autonomy while enabling collective action where it adds value. Subsidiarity reflects the fundamental tension in EU integration between the efficiency gains of centralized action and the democratic and accountability benefits of national decision-making.

The Treaty of Lisbon (2007)

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The Treaty of Lisbon, signed on 13 December 2007, entered into force on 1 December 2009. It amended the Maastricht Treaty and the Treaty of Rome without replacing them, providing the European Union with modernized institutions and enhanced decision-making capacity. Lisbon resolved the institutional impasse following the failure of the Constitutional Treaty and equipped the enlarged EU of 27 Member States to function effectively. It is the most recent major reform of the EU’s constitutional foundations and the legal basis for the current institutional architecture.

Mangold (2005): General Principles and Horizontal Direct Effect

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Mangold v Helm (Case C-144/04) is a landmark judgment of the European Court of Justice that established that the general principle of non-discrimination on grounds of age has horizontal direct effect in disputes between private parties. Decided on 22 November 2005, the case significantly expanded the reach of general principles of EU law and remains among the most controversial decisions in EU legal history, provoking sustained academic criticism and raising fundamental questions about judicial lawmaking, legal certainty, and the limits of EU competence.

Proportionality in EU Law

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The principle of proportionality is a general principle of EU law that requires EU institutions and Member States to ensure that measures restricting rights or imposing obligations do not go beyond what is necessary to achieve legitimate objectives. It operates as a cornerstone of EU constitutional law, influencing legislation, administration, and judicial review across virtually all areas of Union activity. Proportionality functions as a limit on exercises of public power, ensuring that the means employed are proportionate to the ends pursued.

The EU Charter of Fundamental Rights

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The Charter of Fundamental Rights of the European Union is the EU’s legally binding human rights instrument. Proclaimed in 2000 and given binding legal effect by the Treaty of Lisbon in 2009, the Charter codifies the civil, political, economic, and social rights of EU citizens and residents. It applies to EU institutions and to Member States when implementing EU law. The Charter represents the culmination of the EU’s evolution from an economic community to a polity with constitutional fundamental rights protections.

The Four Fundamental Freedoms of the EU Single Market

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The four fundamental freedoms of the European Union constitute the legal foundation of the single market. They guarantee the free movement of goods, persons, services, and capital across Member State borders, creating an integrated economic area of over 440 million consumers. These freedoms are directly effective Treaty rights that individuals and businesses may invoke before national courts, forming the core of EU economic integration and representing the most advanced example of supranational market governance in the world.

The EU Acquis Communautaire

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The acquis communautaire is the accumulated body of EU law, rights, and obligations that binds all Member States together within the European Union. It comprises the entire legal framework of the EU, including Treaty provisions, legislation, case law, international agreements, and the general principles of EU law. Candidate countries must accept the full acquis before accession, a requirement that ensures legal uniformity across the EU and preserves the integrity of the single market.