To cause to share the same substance or essential nature; to unite substances together.
From Latin 'consubstantiatus' (made of the same substance), from 'con-' (together) + 'substantia' (substance). The verb form developed in religious discourse to describe the theological process of substances uniting or becoming one.
This verb attempts to describe something that medieval people believed happened in church but couldn't physically detect—basically trying to use grammar to explain divine magic, which is why religious arguments about these words got so heated.
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