Mutual or complete penetration; the state of two things thoroughly mixing or blending into each other.
From Latin 'com-' (together) plus 'penetratio' (from 'penetrare', to penetrate). A philosophical and theological term describing the interpenetration of substances or concepts.
Medieval theologians used this word to describe how God and matter could coexist in the Eucharist—two substances occupying the same space, a concept that still puzzles physicists.
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