A reciprocal interpenetration or mutual indwelling, especially used in theology to describe how the three persons of the Trinity exist within each other.
From Latin 'circum' (around) + 'incessio' (a going in, from 'incedere' meaning to go into). This theological term developed in medieval Christian philosophy to explain the paradox of the Trinity's simultaneous unity and distinction.
Medieval theologians coined this mind-bending term to solve a logical puzzle: how can three divine persons be one God? They used 'circumincession' to say each person completely contains and indwells the others—it's like three mirrors reflecting each other infinitely!
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