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And the compulsory disclaimer:
Zionist != Jew. Zionists in my understanding are typically mostly not even ethnic Jews, and the supermajority of Jews certainly are not Zionists. Zionism is a purely political supremacy movement.
We are so OT but what the hell- Supremacy of who over whom?
The definition of Zionism is the Belief that the Jews should have the right live in the Zion (The land of Jerusalem).
Any other interpretation is wrong and based on many other beliefs (some right , some wrong).