Re: "...How would you define the term NAZI?..."
A follower of a totalitarian ideology practicing extreme nationalism combined with socialism, to the exclusive benefit of only one ethnic/national group, about whom a completely false mythos (The Aryan Ubermensch--White Teutonic Superman member of the Aryan "Master Race") is believed and enforced as "religion"; overriding all previous accepted and documentable religious, historical, social, national, military, scientific, and academic thinking.
The "Aryan Mythos" is centered upon the demonization of the Jewish People, wherein all that is problematic in life throughout all of history is blamed solely on the Jew.
The success of the Nazi Movement, according to its doctrine, is possible only with the complete eradication of the Jew from the entire earth.
The "National Socialist Worker's Party" practices the "cult of personality", centered upon the "Der Fuhrerprinzip":
The entire nation is united upon the belief of shared "blood and soil" against any and all other nations, led by just one man who is the nation's leader, primary philosopher, military strategist, and dictator of the entirety of governmental, legal, and social order.
All actions and orders in Nazism are "from the top down" (Fuhrer's orders being carried out by subordinates in a typical pyramid structure downwards), and all responsibilities to the Fuhrer are "from the bottom upwards" (each subordinate directly accountable to his superior above).
Needless to say, in such a society dissent and alternative worldviews are punished with imprisonment and/or death. The Nazi Party owns and controls completely all media, news, government, churches, and schools.
While Nazism was a movement already growing in Germany during the 1920's, it was Adolph Hitler who consolidated and energized it into a mass movement centered entirely on his life and persona.
Now, WhiteWolf...are you satisfied that there's a Jew here who actually knows what the hell he's talking about?