Zion

[zahy-uh n] /ˈzaɪ ən/
noun
1.
a hill in Jerusalem, on which the Temple was built (used to symbolize the city itself, especially as a religious or spiritual center).
2.
the Jewish people.
3.
Palestine as the Jewish homeland and symbol of Judaism.
4.
heaven as the final gathering place of true believers.
5.
a city in NE Illinois.
Also, Sion (for defs 1–4).
Origin
before 1000; < Hebrew sīyyōn; replacing Middle English, Old English Sion < Late Latin (Vulgate) Siōn < Greek (Septuagint) Seiṓn < Hebrew, as above
British Dictionary definitions for Zion

Zion

/ˈzaɪən/
noun
1.
the hill on which the city of Jerusalem stands
2.
(Judaism)
  1. the ancient Israelites of the Bible
  2. the modern Jewish nation
  3. Israel as the national home of the Jewish people
3.
(Christianity) heaven regarded as the city of God and the final abode of his elect
4.
any form of social organization, way of life, or life after death regarded as an ultimate goal
5.
  1. a religious community or its site, regarded as chosen by God and under his special protection
  2. an ideal theocratic community, esp any of the Christian Churches regarded as such a community
Word Origin and History for Zion

Old English Sion, from Greek Seon, from Hebrew Tsiyon, name of a Canaanite hill fortress in Jerusalem captured by David and called in the Bible "City of David." It became the center of Jewish life and worship.

Zion in the Bible

sunny; height, one of the eminences on which Jerusalem was built. It was surrounded on all sides, except the north, by deep valleys, that of the Tyropoeon (q.v.) separating it from Moriah (q.v.), which it surpasses in height by 105 feet. It was the south-eastern hill of Jerusalem. When David took it from the Jebusites (Josh. 15:63; 2 Sam. 5:7) he built on it a citadel and a palace, and it became "the city of David" (1 Kings 8:1; 2 Kings 19:21, 31; 1 Chr. 11:5). In the later books of the Old Testament this name was sometimes used (Ps. 87:2; 149:2; Isa. 33:14; Joel 2:1) to denote Jerusalem in general, and sometimes God's chosen Israel (Ps. 51:18; 87:5). In the New Testament (see SION ØT0003448) it is used sometimes to denote the Church of God (Heb. 12:22), and sometimes the heavenly city (Rev. 14:1).