a pos·te·ri·o·ri 
/ɑˌpoʊˌstiriˈori/ adjective
/ɑˌpoʊˌstiriˈori/ adjective formal : relating to what can be known by observation rather than through an understanding of how certain things work
▪ an a posteriori judgment/justification/explanation — compare a priori
▪ an a posteriori judgment/justification/explanation — compare a priori
— a posteriori adverb
▪ You can't justify what you did a posteriori.
▪ You can't justify what you did a posteriori.
