1) Form of government 2) Fundamental of democracy 
A two-party system is a system where two major political parties dominate politics within a government. One of the two parties typically holds a majority in the legislature and is usually referred to as the majority party while the other is the minority party. The term has different senses. For example, in the United States, Jamaica, and Malta, th...
political system in which the electorate gives its votes largely to only two major parties and in which one or the other party can win a majority in ... [5 related articles]
A party system in which there are two credible contenders for power and either is capable of winning any election.
a political system consisting chiefly of two major parties, more or less equal in strength.