from
The Collaborative International Dictionary of English v.0.48
A posteriori \A` pos*te`ri*o"ri\ [L. a (ab) + posterior latter.]
1. (Logic) Characterizing that kind of reasoning which
derives propositions from the observation of facts, or by
generalizations from facts arrives at principles and
definitions, or infers causes from effects. This is the
reverse of a priori reasoning.
[1913 Webster]
2. (Philos.) Applied to knowledge which is based upon or
derived from facts through induction or experiment;
inductive or empirical.
[1913 Webster] Apostil