Thayer's Greek Lexicon

 1. an encampment
  1) the camp of Israel in the desert
1a1. used for the city of Jerusalem, inasmuch as that was to
the Israelites what formerly the encampment had been in
the desert
1a2. of the sacred congregation or assembly of Israel, as it
had been gathered formerly in camps in the wilderness
  2) the barracks of the Roman soldiers, which at Jerusalem
were in the castle of Antonia
2. an army in a line of battle