A distinction or definition that separates one thing from another by clearly marking their differences or boundaries.
From Greek 'diorismos' (distinction), derived from 'diorizo' (to divide or distinguish). The term was used in ancient logic and philosophy to describe precise demarcation.
Ancient Greek philosophers used 'diorism' to win arguments—it's the formal way of drawing a line and saying 'this side is this thing, that side is that thing, and never shall they meet.'
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