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2 definitions found
 for a posteriori
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

From WordNet (r) 3.0 (2006) :

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

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