1. (a.) Characterizing that kind of reasoning which deduces consequences from definitions formed, or principles assumed, or which infers effects from causes previously known; deductive or deductively. The reverse of a posteriori.

2. (a.) Applied to knowledge and conceptions assumed, or presupposed, as prior to experience, in order to make experience rational or possible.

a fortiori a posteriori analytic back backward categorical conditional deducible deductive derivable dialectic discursive dogmatic early enthymematic epagogic ex post facto hypothetical inductive inferential into the past maieutic reasoned retroactive retrospective soritical syllogistic synthetic