Tzimtzum
Tzimtzum or tsimtsum (Hebrew: צִמְצוּם, romanized: ṣimṣum, lit. 'contraction, constriction, condensation') is a term used in Lurianic Kabbalah to explain Isaac Luria's doctrine that God began the process of creation by limiting the Ohr Ein Sof (infinite light) of the Godhead in order to allow for a conceptual space in which the Four Worlds, or finite realms, could exist. This primordial initial contraction, forming a "vacant space" (חלל הפנוי, ḥalal hapanuy) into which new creative light could beam, is denoted by general reference to the tzimtzum.