All the other definitions are wrong - Zion is the biblical land of Israel (as opposed to modern Israel), not a hill, clan, person or group. A belief that Zion is the Jewish homeland and the best place for Jews to be, as outlined in the Old Testament or Torah, is known as Zionism
. The proper, Hebrew pronunciation is Tsee-On. I know this because I am a Jew, FYI, so anyone who says Zion is, and I quote, "a male with a very very very large set of penis and balls", I am very offended.
And when they took the Ark (of the Covenant) out, Moses would say "The Torah
will come out of Jerusalem, and Your (G-d's) word from Zion.