What is A NON POSSE AD NON ESSE SEQUITUR ARGUMENTUM NECESSARIE NEGATIVE, LICET NON AFFIRMATIVE? Definition of A NON POSSE AD NON ESSE SEQUITUR ARGUMENTUM NECESSARIE NEGATIVE, LICET NON AFFIRMATIVE in Black's Law Dictionary
A literal translation— From impossibility to non-existence the inference follows necessarily in the negative, though not in the affirmative—is as ambiguous as the original. It could be translated thus: The negative inference of non-existence necessarily follows from impossibility of existence, but the affirmative inference of existence cannot be drawn from mere possibility.
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That's the definition of in Black's Law Dictionary - Courtesy of Cekhukum.com.