probabilistic UK /ˌpɹɒb.ə.bɪˈlɪs.tɪk/US /ˌpɹɑ.bə.bɪˈlɪs.tɪk/ adjective2 •Of, pertaining to, or derived using probability. •Of or pertaining to the Roman Catholic doctrine of probabilism. formsmore probabilistic · most probabilistic