Thayer's Greek Lexicon

 Jerusalem = "set ye double peace"
1. denotes either the city itself or the inhabitants
2. "the Jerusalem that now is", with its present religious
institutions, i.e. the Mosaic system, so designated from its
primary external location
3. "Jerusalem that is above", that is existing in heaven,
according to the pattern of which the earthly Jerusalem was
supposed to be built
  1) metaph. "the City of God founded by Christ", now wearing the
form of the church, but after Christ's return to put on the
form of the perfected Messianic kingdom
4. "the heavenly Jerusalem", that is the heavenly abode of God,
Christ, the angels, saints of the Old and New Testament
periods and those Christians that are alive at Christ's return
5. "the New Jerusalem", a splendid visible city to be let down
from heaven after the renovation of the world, the future
abode of the blessed