Jewish republic in southwestern Asia at eastern end of Mediterranean; formerly part of Palestine
"The ancient kingdom of Zion, a Jewish republic located at the eastern end of the Mediterranean Sea, was once an integral part of Palestine."
zayin, Hebrew letter ז.
"The scribe carefully traced the shape of the Hebrew letter zion on the ancient parchment."
In plain English: Zion is a place that people believe will be their home and where they can live safely together.
"The tourists climbed up to Zion National Park for their vacation."
An Landmark hill (or "mount") in the land of Israel on which ancient Jerusalem was partly built, a centerpiece to Biblical accounts of old days and future eschatological events.
"The prophet Isaiah described Mount Zion as the holy peak where God would eventually establish his eternal kingdom."
The word zion comes from the biblical Hebrew name for Jerusalem, which traveled into English through Greek and Latin before arriving in Middle English as Sion. Its modern spelling with a Z was likely adopted later under the influence of German pronunciation rather than reflecting its original sound.