The quality or condition of being able to exist; the capacity or potential for existence.
From exist (Latin existere, to stand forth, to be) combined with -ability (capacity for). This philosophical term emerged in modern usage to discuss metaphysical questions about what can or cannot come into being.
Philosophers use existability when debating whether something is even *possible*—like, does a square circle have existability? (No!) It's a way of asking 'could this thing ever actually exist in reality?'
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