Definition of a posteriori adjective from the Oxford Advanced Learner's Dictionary

 

a posteriori

 adjective,adverb
adjective, adverb
BrE BrE//ˌeɪ ˌpɒsteriˈɔːraɪ//
 
; NAmE NAmE//ˌeɪ ˌpɑːsteriˈɔːraɪ//
 
(from Latin, formal)
 
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analysing something by starting from known facts and then thinking about the possible causes of the facts, for example saying ‘Look, the streets are wet so it must have been raining.’ compare a priori Word Origin early 17th cent.: Latin, ‘from what comes after’.
See the Oxford Advanced American Dictionary entry: a posteriori