Meaning
When David took it from the Jebusites (Josh 15:63; 2Sam 5:7) he built on it a citadel and a palace, and it became "the city of David" (1Kings 8:1; 2Kings 19:21, 31; 1Chr 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) it is used sometimes to denote the Church of God (Heb 12:22), and sometimes the heavenly city (Rev 14:1).