Tricameralism

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Tricameralism is the practice of having three legislative or parliamentary chambers. It is contrasted with unicameralism and bicameralism, which are both far more common.

No national government is currently organized along tricameral lines. The word could describe the Ancien Régime era French Estates-General, though similar semantic arguments are applied since it sometimes met in joint session. The South African Parliament established under the apartheid regime's 1983 constitution was tricameral, as was the Chinese 1947 Constitution and Simón Bolívar's model state. A common feature in these bodies, which also casts some doubt on the appropriateness of the name, is that in several cases one of the three legislatures is not principally concerned with legislating.

There are different varieties of tricameralism. A disputed type of tricameralism is one where there are two legislative bodies, elected or appointed separately, and a third consisting of all members of the two, meeting together. In cases where this is considered tricameralism, such as the Manx Tynwald, the Indonesian People's Consultative Assembly, and the Icelandic Althing (from 1874 to 1991), there is generally an explicit, routine role for the unified house, which distinguishes it from bicameral systems where a joint sitting of the two bodies is used to resolve deadlocks or for special sessions, which is true in several parliaments including Australia, Switzerland and India. Arguments over whether tricameralism should be construed to include this arrangement or not are primarily semantic.