existable en · ADJ
Etymology
From exist + -able.
Meanings
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(not-comparable) Capable of existing; feasible.
Philosophy is the science of the possible as existable. In other words, by the reason of the fact Wolff means a purely conceptualistic explanation in terms of essences and possibilities.
1960, College of Philosophy and Letters, St. Louis University, The Modern schoolman: Volumes 38-39: