From a prospective viewpoint.
Definition of A Priori
Definitions from Black's Law Dictionary: 2nd Edition and Ballentine's Law Dictionary as are available for each term in each dictionary.
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Ballentine's Law Dictionary -
Black's Law Dictionary: 2nd EditionA term used in logic to denote an argument founded on analogy or abstract considerations or one which, positing a general principle or admitted truth as a cause, proceeds to deduce from it the effects which must necessarily follow.