Definition
The constitutional principle dividing governmental authority among three distinct branches — Legislature (Parliament), Executive (President and Council of Ministers), and Judiciary (Courts) — to prevent concentration of power and protect liberty.
Separation of powers is an organisational principle of constitutional democracy, traced to Montesquieu's 'The Spirit of Laws' (1748). India's Constitution does not rigidly separate powers but establishes a system of 'checks and balances' — each branch has some oversight over others. The Legislature makes law; the Executive implements law; the Judiciary interprets law and adjudicates disputes. Overlaps exist: the President (Executive) is part of Parliament; judges (Judiciary) are appointed by the Executive; Parliament (Legislature) can remove judges (Impeachment). The Supreme Court has held that separation of powers is part of the basic structure of the Constitution and cannot be abrogated by constitutional amendment (Kesavananda Bharati).
Statutory Definition
No express provision — the Constitution embodies the separation of powers through its structure. Articles 79-122 (Parliament), Articles 52-78 (Executive), and Articles 124-147 (Judiciary) establish the three branches. The basic structure doctrine (Kesavananda Bharati) includes separation of powers as an unamendable feature.
Etymology & Origin
From Latin 'separatio' (a separation) + 'potestas/potestatum' (power, authority). The philosophical tradition is traced to Montesquieu (1689-1755) who coined 'Trias Politica' — three politics or three powers — as the organisational principle of free government.
Full Legal Analysis
Separation of Powers: The Architecture of Free Government
Separation of powers is the structural principle that prevents tyranny by dividing governmental authority. When all three powers — law-making, law-executing, and law-judging — are concentrated in one hand, liberty cannot survive. By dividing these functions among separate institutions with separate personnel and separate constituencies, the Constitution creates a system where ambition checks ambition, and no single branch can dominate the others indefinitely.
Indian Model: Flexible Separation
India's constitutional model is a 'flexible' separation of powers rather than a rigid one: (a) The President is both Executive head and part of the Legislature (as a component of Parliament under Article 79). (b) The Council of Ministers (Executive) must command majority in the Lok Sabha (Legislature) — the two branches are fused in parliamentary democracy. (c) Judges are appointed by the Executive (Collegium system notwithstanding). (d) Parliament may remove judges (Impeachment). (e) Courts may strike down legislation (Judicial Review). These overlaps are deliberate — they create checks rather than rigid compartmentalisation.
Judicial Review and Separation of Powers
Judicial review — the power of courts to strike down legislation that violates the Constitution — is itself an important expression of separation of powers: the judiciary checks the legislature. In Marbury v. Madison (1803 US), this power was first fully articulated by Chief Justice John Marshall. The Indian Constitution expressly provides for judicial review under Articles 13, 32, and 226 — making it a structural feature rather than a judicially created doctrine (unlike the US).
Basic Structure and Separation of Powers
In Kesavananda Bharati v. State of Kerala AIR 1973 SC 1461, the Supreme Court held that separation of powers between the Legislature, Executive, and Judiciary is part of the basic structure of the Constitution. Parliament cannot, by constitutional amendment, abolish judicial review, vest judicial power in the executive, or eliminate parliamentary oversight of the executive. The basic structure doctrine uses separation of powers as its ultimate guarantee.
“When the legislative and executive powers are united in the same person or body, there can be no liberty. The separation of powers is the Constitution's foundational design for freedom.” — Montesquieu, adapted
