Chabad Knowledge Base
(lit. "supernal worlds"); in Kabbalistic works there is generally reference made to four spiritual worlds: Atzilut - Emanation, Briyah - Creation, Yetzirah - Formation, and Asiyah - Action. In each one of these worlds, the Divine energy becomes progressively more disconnected from its source, thus beginning to feel itself as a separate entity. Our physical world is the lower half of the world of Asiyah, sometimes known as Asiyah HaGashmit.
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Entry for 'Olamot Elyonim'. Chabad Knowledge Base. https://www.studylight.org/dictionaries/eng/ckb/o/olamot-elyonim.html. 2012.