Unicameralism, the first majoritarian feature

In a majoritarian system, the legislature is unicameral, composed of one legislative chamber.

Examples of unicameral legislatures are the Knesseth of Israel, the Storting of Norway, the House of Representatives of New Zealand, the Legislature of the State of Nebraska, the Jonesboro City Council, and the Craighead County Quorum Court.

A nonmajoritarian alternative to unicameralism is bicameralism where the legislature is composed of two chambers.  Examples of bicameral legislatures are the United States Congress (House of Representatives and Senate), the Staten Generaal of the Netherlands (the Eerste Kamer and the Tweede Kamer [First Chamber, Second Chamber--ah those imaginative Dutchmen]), the French Parliament (National Assembly and Senate), the Diet of Japan (House of Representatives and House of Councillors), and the Arkansas General Assemby (House of Representatives and Senate).

In some but not all bicameral legislatures, one chamber may have more power than the other.  Moreover, the two chambers may be represent the population in different ways.  To give just one example, the US House and Senate are roughly equal in power, but the basis of representation is different--the House is based on population by state, but each state has two senators regardless of population. 

Another example of a bicameral legislature is the British Parliament, composed of the House of Commons and the House of Lords.  It is because of its bicameral legislature that Britain is not a majoritarian system.  On the other hand, the House of Lords has very limited power:  it can delay legislation by one year, but not block it, and it has no delaying power with respect to budget bills.  While, Great Britain is very close to being a majoritarian system, closeness only counts in horseshoes and dancing.  Some members of the Labour Party have favored (or is that favoured?) elimination of the House of Lords; if that were to happen, Britain would achieve the status of a majoritarian system.

And, now on to the second majoritarian feature, the fusion of legislative and executive power...