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A legislature is a deliberative assembly with the authority to make laws for a political entity such as a country or city. Legislatures form important parts of most governments; in the separation of powers model, they are often contrasted with the executive and judicial branches of government.

Laws enacted by legislatures are known as primary legislation. Legislatures observe and steer governing actions and usually have exclusive authority to amend the budget or budgets involved in the process.

The members of a legislature are called legislators. In a democracy, legislators are most commonly popularly elected, although indirect election and appointment by the executive are also used, particularly for bicameral legislatures featuring an upper chamber.

Terminology

Map showing the terminology for each country's legislature.

Names for national legislatures include "parliament", "congress", "diet", and "assembly", depending on country.

Internal organization

Each chamber of the legislature consists of a number of legislators who use some form of parliamentary procedure to debate political issues and vote on proposed legislation. There must be a certain number of legislators present to carry out these activities; this is called a quorum.

Some of the responsibilities of a legislature, such as giving first consideration to newly proposed legislation, are usually delegated to committees made up of a few of the members of the chamber(s).

The members of a legislature usually represent different political parties; the members from each party generally meet as a caucus to organize their internal affairs.

Power

Legislatures vary widely in the amount of political power they wield, compared to other political players such as judiciaries, militaries, and executives. In 2009, political scientists M. Steven Fish and Matthew Kroenig constructed a Parliamentary Powers Index in an attempt to quantify the different degrees of power among national legislatures. The German Bundestag, the Italian Parliament, and the Mongolian State Great Khural tied for most powerful, while Myanmar's House of Representatives and Somalia's Transitional Federal Assembly (since replaced by the Federal Parliament of Somalia) tied for least powerful.

Some political systems follow the principle of legislative supremacy, which holds that the legislature is the supreme branch of government and cannot be bound by other institutions, such as the judicial branch or a written constitution. Such a system renders the legislature more powerful.

In parliamentary and semi-presidential systems of government, the executive is responsible to the legislature, which may remove it with a vote of no confidence. On the other hand, according to the separation of powers doctrine, the legislature in a presidential system is considered an independent and coequal branch of government along with both the judiciary and the executive.<ref>{{cite web|title=Governing Systems and Executive-Legislative Relations (Presidential, Parliament