Technically, the word NAZI was the acronym for the National Socialist German Worker's Party. It was a fascist movement that had its roots in the European nationalist and socialist movements, and that developed a grotesque biologically-determinant view of so-called "Aryan" supremacy. (Here we use "national socialism" to refer to the early Nazi movement before Hitler came to power, sometimes termed the "Brownshirt" phase, and the term "Nazi" to refer to the movement after it had consolidated around ideological fascism.)
The seeds of fascism, however, were planted in Italy. "Fascism is reaction," said Mussolini, but reaction to what? The reactionary movement following World War I was based on a rejection of the social theories that formed the basis of the 1789 French Revolution, and whose early formulations in this country had a major influence on our Declaration of Independence, Constitution, and Bill of Rights.
It was Rousseau who is best known for crystallizing these modern social theories in . The progeny of these theories are sometimes called Modernism or Modernity because they challenged social theories generally accepted since the days of Machiavelli. The response to the French Revolution and Rousseau, by Hegel, Marx, Nietzsche, and others, poured into an intellectual stew which served up Marxism, socialism, national socialism, fascism, modern liberalism, modern conservatism, communism, and a variety of forms of capitalist participatory democracy.
Fascists particularly loathed the social theories of the French Revolution and its slogan: "Liberty, Equality, Fraternity."
The governments and parties most often considered to have been fascist include Nazi Germany under Adolf Hitler, Spain's Falange, Portugal's Estado Novo, Hungary's Arrow Cross Party, Romania's Iron Guard, and other similar movements that existed across Europe in the 1920s and 1930s. Some authors reject this broader use of the term or exclude certain of these parties and regimes.
In both popular thought and academic scholarship, Nazism is generally considered a form of fascism - with "fascism" defined so as to include any of the authoritarian, nationalist, totalitarian movements that developed in Europe around the same time. The debate focuses mainly on comparisons of fascists movements in general with the Italian prototype, including the fascists in Germany. The idea mentioned above to reject all former ideas and ideologies like democracy, liberalism, and especially marxism make it difficult to track down a perfect definition of these two terms.
The term "National Socialism", derives from this citizen-nation relationship, whereby the term socialism is invoked and is meant to be realized through the common duty of the individuals to the German people; all actions are to be in service of the Reich. In practice, the Nazis argued, their goal was to bring forth a nation-state as the locus and embodiment of the people's collective will, bound by the Volksgemeinschaft as both an ideal and an operating instrument. In comparison, non-national socialist ideologies oppose the idea of nations, which they see as artificial divisions that support the status quo and oppression by the capital owners.