What is "atziluth"

Atziluth or Atzilut (also Olam Atzilut, עולם אצילות, literally "the World of Emanation"), is the highest of four worlds in which exists the Kabbalistic Tree of Life. Beri'ah follows it. It is known as the World of Emanations, or the World of Causes. In the Kabbalah, each of the Sephiroth in this world is associated with a Name of God, and it is associated with the Suit of Wands in the Tarot.