The quality or state of having the same substance or being made of the same essential material.
From Latin 'consubstantialis' (sharing the same substance) + '-ity' (quality or condition). This abstract noun form developed in theological contexts to describe the philosophical relationship between different entities sharing identical substance.
The Trinity doctrine depends entirely on this concept—Christian theologians had to explain how three separate beings (Father, Son, Holy Ghost) could be 'consubstantial' or made of the same divine stuff, which became one of the most mind-bending philosophical problems in Western thought.
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