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Concept
Bicameralism
Summary
Bicameralism is a type of legislature that is divided into two separate assemblies, chambers, or houses, known as a bicameral legislature. Bicameralism is distinguished from unicameralism, in which all members deliberate and vote as a single group. , roughly 40% of world's national legislatures are bicameral, while unicameralism represents 60% nationally, and much more at the subnational level.
Often, the members of the two chambers are elected or selected by different methods, which vary from jurisdiction to jurisdiction. This can often lead to the two chambers having very different compositions of members.
Enactment of primary legislation often requires a concurrent majority—the approval of a majority of members in each of the chambers of the legislature. When this is the case, the legislature may be called an example of perfect bicameralism. However, in many parliamentary and semi-presidential systems, the house to which the executive is responsible (e.g. House of Commons of UK and National Assembly of France) can overrule the other house (e.g. House of Lords of UK and Senate of France) and may be regarded as an example of imperfect bicameralism. Some legislatures lie in between these two positions, with one house able to overrule the other only under certain circumstances.
The British Parliament is often referred to as the "Mother of Parliaments" (in fact a misquotation of John Bright, who remarked in 1865 that "England is the Mother of Parliaments") because the British Parliament has been the model for most other parliamentary systems, and its Acts have created many other parliaments. The origins of British bicameralism can be traced to 1341, when the Commons met separately from the nobility and clergy for the first time, creating what was effectively an Upper Chamber and a Lower Chamber, with the knights and burgesses sitting in the latter. This Upper Chamber became known as the House of Lords from 1544 onward, and the Lower Chamber became known as the House of Commons, collectively known as the Houses of Parliament.
Official source
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