a posteriori a posteriori /ə ˌpoʊstɪəˈrɪəraɪ/

adjective

1. Involving reasoning from facts or particulars to general principles or from effects to causes  ( a posteriori )
   involving reasoning from facts or particulars to general principles or from effects to causes
    A posteriori demonstration
   a posteriori demonstration
   
2. Requiring evidence for validation or support  ( a posteriori )
   requiring evidence for validation or support
   

adverb

1. Derived from observed facts  ( a posteriori )
   derived from observed facts