a pos·te·ri·o·ri /ˌɑ(ˌ)poˌstɪriˈori, ˌstɛr; ˌe(ˌ)pɑˌstɪriˈorˌaɪ, (ˌ)po, ˈori; ˈɔr-/



 A pos·te·ri·o·ri
 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.
 2. Philos. Applied to knowledge which is based upon or derived from facts through induction or experiment; inductive or empirical.

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 a posteriori
      adj 1: involving reasoning from facts or particulars to general
             principals or from effects to causes; "a posteriori
             demonstration" [ant: a priori]
      2: requiring evidence for validation or support
      adv : derived from observed facts [ant: a priori]