EX POST FACTO Meaning of EX POST FACTO in English ex post facto BrE AmE ˌeks ˌpəʊs t ˈfækt əʊ •ˌ•- AmE \ -ˌpoʊs t ˈfækt oʊ Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012