A posteriori is a process of arguing from the cause to the effect. It uses experiment or empirical observation to induce the cause of a particular set of facts.

George V reigned from 1910 to 1936. This is something that (if true) one must come to know a posteriori, because it expresses an empirical fact unknowable by reason alone.

See, a priori, a fortiori.

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A fortiori A posteriori A priori Ab initio